HttpServletResponse (Java EE 5)

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javax.servlet.http Interface HttpServletResponse

All Superinterfaces:
ServletResponse
All Known Implementing Classes:
HttpServletResponseWrapper
public interface HttpServletResponse
extends ServletResponse

Implements: ServletResponse
Implemented by: HttpServletResponseWrapper

扩展 ServletResponse 接口以提供特定于 HTTP 的发送响应功能。例如，该接口拥有访问 HTTP 头和 cookie 的方法。

servlet 容器创建 HttpServletResponse 对象，并将该对象作为参数传递给 servlet 的 service 方法（doGet、doPost，等等）。

See also javax.servlet.ServletResponse

英文文档：

Extends the ServletResponse interface to provide HTTP-specific functionality in sending a response. For example, it has methods to access HTTP headers and cookies.

The servlet container creates an HttpServletResponse object and passes it as an argument to the servlet's service methods (doGet, doPost, etc).

Author:
Various
See Also:
ServletResponse

Field Summary
static int SC_ACCEPTED
          Status code (202) indicating that a request was accepted for processing, but was not completed.
static int SC_BAD_GATEWAY
          Status code (502) indicating that the HTTP server received an invalid response from a server it consulted when acting as a proxy or gateway.
static int SC_BAD_REQUEST
          Status code (400) indicating the request sent by the client was syntactically incorrect.
static int SC_CONFLICT
          Status code (409) indicating that the request could not be completed due to a conflict with the current state of the resource.
static int SC_CONTINUE
          Status code (100) indicating the client can continue.
static int SC_CREATED
          Status code (201) indicating the request succeeded and created a new resource on the server.
static int SC_EXPECTATION_FAILED
          Status code (417) indicating that the server could not meet the expectation given in the Expect request header.
static int SC_FORBIDDEN
          Status code (403) indicating the server understood the request but refused to fulfill it.
static int SC_FOUND
          Status code (302) indicating that the resource reside temporarily under a different URI.
static int SC_GATEWAY_TIMEOUT
          Status code (504) indicating that the server did not receive a timely response from the upstream server while acting as a gateway or proxy.
static int SC_GONE
          Status code (410) indicating that the resource is no longer available at the server and no forwarding address is known.
static int SC_HTTP_VERSION_NOT_SUPPORTED
          Status code (505) indicating that the server does not support or refuses to support the HTTP protocol version that was used in the request message.
static int SC_INTERNAL_SERVER_ERROR
          Status code (500) indicating an error inside the HTTP server which prevented it from fulfilling the request.
static int SC_LENGTH_REQUIRED
          Status code (411) indicating that the request cannot be handled without a defined Content-Length.
static int SC_METHOD_NOT_ALLOWED
          Status code (405) indicating that the method specified in the Request-Line is not allowed for the resource identified by the Request-URI.
static int SC_MOVED_PERMANENTLY
          Status code (301) indicating that the resource has permanently moved to a new location, and that future references should use a new URI with their requests.
static int SC_MOVED_TEMPORARILY
          Status code (302) indicating that the resource has temporarily moved to another location, but that future references should still use the original URI to access the resource.
static int SC_MULTIPLE_CHOICES
          Status code (300) indicating that the requested resource corresponds to any one of a set of representations, each with its own specific location.
static int SC_NO_CONTENT
          Status code (204) indicating that the request succeeded but that there was no new information to return.
static int SC_NON_AUTHORITATIVE_INFORMATION
          Status code (203) indicating that the meta information presented by the client did not originate from the server.
static int SC_NOT_ACCEPTABLE
          Status code (406) indicating that the resource identified by the request is only capable of generating response entities which have content characteristics not acceptable according to the accept headers sent in the request.
static int SC_NOT_FOUND
          Status code (404) indicating that the requested resource is not available.
static int SC_NOT_IMPLEMENTED
          Status code (501) indicating the HTTP server does not support the functionality needed to fulfill the request.
static int SC_NOT_MODIFIED
          Status code (304) indicating that a conditional GET operation found that the resource was available and not modified.
static int SC_OK
          Status code (200) indicating the request succeeded normally.
static int SC_PARTIAL_CONTENT
          Status code (206) indicating that the server has fulfilled the partial GET request for the resource.
static int SC_PAYMENT_REQUIRED
          Status code (402) reserved for future use.
static int SC_PRECONDITION_FAILED
          Status code (412) indicating that the precondition given in one or more of the request-header fields evaluated to false when it was tested on the server.
static int SC_PROXY_AUTHENTICATION_REQUIRED
          Status code (407) indicating that the client MUST first authenticate itself with the proxy.
static int SC_REQUEST_ENTITY_TOO_LARGE
          Status code (413) indicating that the server is refusing to process the request because the request entity is larger than the server is willing or able to process.
static int SC_REQUEST_TIMEOUT
          Status code (408) indicating that the client did not produce a request within the time that the server was prepared to wait.
static int SC_REQUEST_URI_TOO_LONG
          Status code (414) indicating that the server is refusing to service the request because the Request-URI is longer than the server is willing to interpret.
static int SC_REQUESTED_RANGE_NOT_SATISFIABLE
          Status code (416) indicating that the server cannot serve the requested byte range.
static int SC_RESET_CONTENT
          Status code (205) indicating that the agent SHOULD reset the document view which caused the request to be sent.
static int SC_SEE_OTHER
          Status code (303) indicating that the response to the request can be found under a different URI.
static int SC_SERVICE_UNAVAILABLE
          Status code (503) indicating that the HTTP server is temporarily overloaded, and unable to handle the request.
static int SC_SWITCHING_PROTOCOLS
          Status code (101) indicating the server is switching protocols according to Upgrade header.
static int SC_TEMPORARY_REDIRECT
          Status code (307) indicating that the requested resource resides temporarily under a different URI.
static int SC_UNAUTHORIZED
          Status code (401) indicating that the request requires HTTP authentication.
static int SC_UNSUPPORTED_MEDIA_TYPE
          Status code (415) indicating that the server is refusing to service the request because the entity of the request is in a format not supported by the requested resource for the requested method.
static int SC_USE_PROXY
          Status code (305) indicating that the requested resource MUST be accessed through the proxy given by the Location field.
 
Method Summary
 void addCookie(Cookie cookie)
          Adds the specified cookie to the response.
 void addDateHeader(String name, long date)
          Adds a response header with the given name and date-value.
 void addHeader(String name, String value)
          Adds a response header with the given name and value.
 void addIntHeader(String name, int value)
          Adds a response header with the given name and integer value.
 boolean containsHeader(String name)
          Returns a boolean indicating whether the named response header has already been set.
 String encodeRedirectUrl(String url)
          Deprecated. As of version 2.1, use encodeRedirectURL(String url) instead
 String encodeRedirectURL(String url)
          Encodes the specified URL for use in the sendRedirect method or, if encoding is not needed, returns the URL unchanged.
 String encodeUrl(String url)
          Deprecated. As of version 2.1, use encodeURL(String url) instead
 String encodeURL(String url)
          Encodes the specified URL by including the session ID in it, or, if encoding is not needed, returns the URL unchanged.
 void sendError(int sc)
          Sends an error response to the client using the specified status code and clearing the buffer.
 void sendError(int sc, String msg)
          Sends an error response to the client using the specified status.
 void sendRedirect(String location)
          Sends a temporary redirect response to the client using the specified redirect location URL.
 void setDateHeader(String name, long date)
          Sets a response header with the given name and date-value.
 void setHeader(String name, String value)
          Sets a response header with the given name and value.
 void setIntHeader(String name, int value)
          Sets a response header with the given name and integer value.
 void setStatus(int sc)
          Sets the status code for this response.
 void setStatus(int sc, String sm)
          Deprecated. As of version 2.1, due to ambiguous meaning of the message parameter. To set a status code use setStatus(int), to send an error with a description use sendError(int, String). Sets the status code and message for this response.
 
Methods inherited from interface javax.servlet.ServletResponse
flushBuffer, getBufferSize, getCharacterEncoding, getContentType, getLocale, getOutputStream, getWriter, isCommitted, reset, resetBuffer, setBufferSize, setCharacterEncoding, setContentLength, setContentType, setLocale
 

Field Detail

英文文档：

SC_CONTINUE 

static final int SC_CONTINUE
Status code (100) indicating the client can continue.

See Also:
Constant Field Values

英文文档：

SC_SWITCHING_PROTOCOLS 

static final int SC_SWITCHING_PROTOCOLS
Status code (101) indicating the server is switching protocols according to Upgrade header.

See Also:
Constant Field Values

英文文档：

SC_OK 

static final int SC_OK
Status code (200) indicating the request succeeded normally.

See Also:
Constant Field Values

英文文档：

SC_CREATED 

static final int SC_CREATED
Status code (201) indicating the request succeeded and created a new resource on the server.

See Also:
Constant Field Values

英文文档：

SC_ACCEPTED 

static final int SC_ACCEPTED
Status code (202) indicating that a request was accepted for processing, but was not completed.

See Also:
Constant Field Values

英文文档：

SC_NON_AUTHORITATIVE_INFORMATION 

static final int SC_NON_AUTHORITATIVE_INFORMATION
Status code (203) indicating that the meta information presented by the client did not originate from the server.

See Also:
Constant Field Values

英文文档：

SC_NO_CONTENT 

static final int SC_NO_CONTENT
Status code (204) indicating that the request succeeded but that there was no new information to return.

See Also:
Constant Field Values

英文文档：

SC_RESET_CONTENT 

static final int SC_RESET_CONTENT
Status code (205) indicating that the agent SHOULD reset the document view which caused the request to be sent.

See Also:
Constant Field Values

英文文档：

SC_PARTIAL_CONTENT 

static final int SC_PARTIAL_CONTENT
Status code (206) indicating that the server has fulfilled the partial GET request for the resource.

See Also:
Constant Field Values

英文文档：

SC_MULTIPLE_CHOICES 

static final int SC_MULTIPLE_CHOICES
Status code (300) indicating that the requested resource corresponds to any one of a set of representations, each with its own specific location.

See Also:
Constant Field Values

英文文档：

SC_MOVED_PERMANENTLY 

static final int SC_MOVED_PERMANENTLY
Status code (301) indicating that the resource has permanently moved to a new location, and that future references should use a new URI with their requests.

See Also:
Constant Field Values

英文文档：

SC_MOVED_TEMPORARILY 

static final int SC_MOVED_TEMPORARILY
Status code (302) indicating that the resource has temporarily moved to another location, but that future references should still use the original URI to access the resource. This definition is being retained for backwards compatibility. SC_FOUND is now the preferred definition.

See Also:
Constant Field Values

英文文档：

SC_FOUND 

static final int SC_FOUND
Status code (302) indicating that the resource reside temporarily under a different URI. Since the redirection might be altered on occasion, the client should continue to use the Request-URI for future requests.(HTTP/1.1) To represent the status code (302), it is recommended to use this variable.

See Also:
Constant Field Values

英文文档：

SC_SEE_OTHER 

static final int SC_SEE_OTHER
Status code (303) indicating that the response to the request can be found under a different URI.

See Also:
Constant Field Values

英文文档：

SC_NOT_MODIFIED 

static final int SC_NOT_MODIFIED
Status code (304) indicating that a conditional GET operation found that the resource was available and not modified.

See Also:
Constant Field Values

英文文档：

SC_USE_PROXY 

static final int SC_USE_PROXY
Status code (305) indicating that the requested resource MUST be accessed through the proxy given by the Location field.

See Also:
Constant Field Values

英文文档：

SC_TEMPORARY_REDIRECT 

static final int SC_TEMPORARY_REDIRECT
Status code (307) indicating that the requested resource resides temporarily under a different URI. The temporary URI SHOULD be given by the Location field in the response.

See Also:
Constant Field Values

英文文档：

SC_BAD_REQUEST 

static final int SC_BAD_REQUEST
Status code (400) indicating the request sent by the client was syntactically incorrect.

See Also:
Constant Field Values

英文文档：

SC_UNAUTHORIZED 

static final int SC_UNAUTHORIZED
Status code (401) indicating that the request requires HTTP authentication.

See Also:
Constant Field Values

英文文档：

SC_PAYMENT_REQUIRED 

static final int SC_PAYMENT_REQUIRED
Status code (402) reserved for future use.

See Also:
Constant Field Values

英文文档：

SC_FORBIDDEN 

static final int SC_FORBIDDEN
Status code (403) indicating the server understood the request but refused to fulfill it.

See Also:
Constant Field Values

英文文档：

SC_NOT_FOUND 

static final int SC_NOT_FOUND
Status code (404) indicating that the requested resource is not available.

See Also:
Constant Field Values

英文文档：

SC_METHOD_NOT_ALLOWED 

static final int SC_METHOD_NOT_ALLOWED
Status code (405) indicating that the method specified in the Request-Line is not allowed for the resource identified by the Request-URI.

See Also:
Constant Field Values

英文文档：

SC_NOT_ACCEPTABLE 

static final int SC_NOT_ACCEPTABLE
Status code (406) indicating that the resource identified by the request is only capable of generating response entities which have content characteristics not acceptable according to the accept headers sent in the request.

See Also:
Constant Field Values

英文文档：

SC_PROXY_AUTHENTICATION_REQUIRED 

static final int SC_PROXY_AUTHENTICATION_REQUIRED
Status code (407) indicating that the client MUST first authenticate itself with the proxy.

See Also:
Constant Field Values

英文文档：

SC_REQUEST_TIMEOUT 

static final int SC_REQUEST_TIMEOUT
Status code (408) indicating that the client did not produce a request within the time that the server was prepared to wait.

See Also:
Constant Field Values

英文文档：

SC_CONFLICT 

static final int SC_CONFLICT
Status code (409) indicating that the request could not be completed due to a conflict with the current state of the resource.

See Also:
Constant Field Values

英文文档：

SC_GONE 

static final int SC_GONE
Status code (410) indicating that the resource is no longer available at the server and no forwarding address is known. This condition SHOULD be considered permanent.

See Also:
Constant Field Values

英文文档：

SC_LENGTH_REQUIRED 

static final int SC_LENGTH_REQUIRED
Status code (411) indicating that the request cannot be handled without a defined Content-Length.

See Also:
Constant Field Values

英文文档：

SC_PRECONDITION_FAILED 

static final int SC_PRECONDITION_FAILED
Status code (412) indicating that the precondition given in one or more of the request-header fields evaluated to false when it was tested on the server.

See Also:
Constant Field Values

英文文档：

SC_REQUEST_ENTITY_TOO_LARGE 

static final int SC_REQUEST_ENTITY_TOO_LARGE
Status code (413) indicating that the server is refusing to process the request because the request entity is larger than the server is willing or able to process.

See Also:
Constant Field Values

英文文档：

SC_REQUEST_URI_TOO_LONG 

static final int SC_REQUEST_URI_TOO_LONG
Status code (414) indicating that the server is refusing to service the request because the Request-URI is longer than the server is willing to interpret.

See Also:
Constant Field Values

英文文档：

SC_UNSUPPORTED_MEDIA_TYPE 

static final int SC_UNSUPPORTED_MEDIA_TYPE
Status code (415) indicating that the server is refusing to service the request because the entity of the request is in a format not supported by the requested resource for the requested method.

See Also:
Constant Field Values

英文文档：

SC_REQUESTED_RANGE_NOT_SATISFIABLE 

static final int SC_REQUESTED_RANGE_NOT_SATISFIABLE
Status code (416) indicating that the server cannot serve the requested byte range.

See Also:
Constant Field Values

英文文档：

SC_EXPECTATION_FAILED 

static final int SC_EXPECTATION_FAILED
Status code (417) indicating that the server could not meet the expectation given in the Expect request header.

See Also:
Constant Field Values

英文文档：

SC_INTERNAL_SERVER_ERROR 

static final int SC_INTERNAL_SERVER_ERROR
Status code (500) indicating an error inside the HTTP server which prevented it from fulfilling the request.

See Also:
Constant Field Values

英文文档：

SC_NOT_IMPLEMENTED 

static final int SC_NOT_IMPLEMENTED
Status code (501) indicating the HTTP server does not support the functionality needed to fulfill the request.

See Also:
Constant Field Values

英文文档：

SC_BAD_GATEWAY 

static final int SC_BAD_GATEWAY
Status code (502) indicating that the HTTP server received an invalid response from a server it consulted when acting as a proxy or gateway.

See Also:
Constant Field Values

英文文档：

SC_SERVICE_UNAVAILABLE 

static final int SC_SERVICE_UNAVAILABLE
Status code (503) indicating that the HTTP server is temporarily overloaded, and unable to handle the request.

See Also:
Constant Field Values

英文文档：

SC_GATEWAY_TIMEOUT 

static final int SC_GATEWAY_TIMEOUT
Status code (504) indicating that the server did not receive a timely response from the upstream server while acting as a gateway or proxy.

See Also:
Constant Field Values

英文文档：

SC_HTTP_VERSION_NOT_SUPPORTED 

static final int SC_HTTP_VERSION_NOT_SUPPORTED
Status code (505) indicating that the server does not support or refuses to support the HTTP protocol version that was used in the request message.

See Also:
Constant Field Values

Method Detail

public void addCookie(Cookie cookie)
将指定 cookie 添加到响应。可多次调用此方法设置一个以上的 cookie。
cookie 要返回给客户端的 Cookie
英文文档：

addCookie

void addCookie(Cookie cookie)
Adds the specified cookie to the response. This method can be called multiple times to set more than one cookie.

Parameters:
cookie - the Cookie to return to the client

public boolean containsHeader(String name)
返回一个 boolean 值，指示是否已经设置指定的响应头。
name 头名称
return 如果已经设置指定的响应头，则返回 true；否则返回 false
英文文档：

containsHeader

boolean containsHeader(String name)
Returns a boolean indicating whether the named response header has already been set.

Parameters:
name - the header name
Returns:
true if the named response header has already been set; false otherwise

public String encodeURL(String url)
通过将会话 ID 包含在指定 URL 中对该 URL 进行编码，如果不需要编码，则返回未更改的 URL。此方法的实现包含可以确定会话 ID 是否需要在 URL 中编码的逻辑。例如，如果浏览器支持 cookie，或者关闭了会话跟踪，则 URL 编码就不是必需的。

对于健壮的会话跟踪，servlet 发出的所有 URL 都应该通过此方法运行。否则，URL 重写不能用于不支持 cookie 的浏览器。

url 要编码的 URL。
return 如果需要编码，则返回编码的 URL；否则返回未更改的 URL。

英文文档：

encodeURL

String encodeURL(String url)
Encodes the specified URL by including the session ID in it, or, if encoding is not needed, returns the URL unchanged. The implementation of this method includes the logic to determine whether the session ID needs to be encoded in the URL. For example, if the browser supports cookies, or session tracking is turned off, URL encoding is unnecessary.

For robust session tracking, all URLs emitted by a servlet should be run through this method. Otherwise, URL rewriting cannot be used with browsers which do not support cookies.

Parameters:
url - the url to be encoded.
Returns:
the encoded URL if encoding is needed; the unchanged URL otherwise.

public String encodeRedirectURL(String url)
对指定 URL 进行编码，以便在 sendRedirect 方法中使用它，如果不需要编码，则返回未更改的 URL。此方法的实现包含可以确定会话 ID 是否需要在 URL 中编码的逻辑。因为进行此确定的规则可能不同于用来确定是否对普通链接进行编码的规则，所以此方法与 encodeURL 方法是分开的。

发送到 HttpServletResponse.sendRedirect 方法的所有 URL 都应该通过此方法运行。否则，URL 重写不能用于不支持 cookie 的浏览器。

url 要编码的 URL。
return 如果需要编码，则返回编码的 URL；否则返回未更改的 URL。
See also sendRedirect, encodeUrl

英文文档：

encodeRedirectURL

String encodeRedirectURL(String url)
Encodes the specified URL for use in the sendRedirect method or, if encoding is not needed, returns the URL unchanged. The implementation of this method includes the logic to determine whether the session ID needs to be encoded in the URL. Because the rules for making this determination can differ from those used to decide whether to encode a normal link, this method is separated from the encodeURL method.

All URLs sent to the HttpServletResponse.sendRedirect method should be run through this method. Otherwise, URL rewriting cannot be used with browsers which do not support cookies.

Parameters:
url - the url to be encoded.
Returns:
the encoded URL if encoding is needed; the unchanged URL otherwise.
See Also:
sendRedirect(java.lang.String), encodeUrl(java.lang.String)

public String encodeUrl(String url)
deprecated 从版本 2.1 起，请改用 encodeURL(String url)
url 要编码的 URL。
return 如果需要编码，则返回编码的 URL；否则返回未更改的 URL。
英文文档：

encodeUrl

String encodeUrl(String url)
Deprecated. As of version 2.1, use encodeURL(String url) instead

Parameters:
url - the url to be encoded.
Returns:
the encoded URL if encoding is needed; the unchanged URL otherwise.

public String encodeRedirectUrl(String url)
deprecated 从版本 2.1 起，请改用 encodeRedirectURL(String url)
url 要编码的 URL。
return 如果需要编码，则返回编码的 URL；否则返回未更改的 URL。
英文文档：

encodeRedirectUrl

String encodeRedirectUrl(String url)
Deprecated. As of version 2.1, use encodeRedirectURL(String url) instead

Parameters:
url - the url to be encoded.
Returns:
the encoded URL if encoding is needed; the unchanged URL otherwise.

public void sendError(int sc, String msg) throws java.io.IOException
使用指定状态将错误响应发送到客户端。默认情况下，服务器将创建类似 HTML 格式的服务器错误页面的响应，该页面包含指定消息，内容类型设置为 "text/html"，并且保持 cookie 和其他头不变。 如果已经对 Web 应用程序进行了对应于传入状态代码的错误页面声明，则将优先处理建议的 msg 参数。

如果已经提交了响应，则此方法抛出 IllegalStateException。使用此方法后，响应应该被视为已经被提交，不能再写入。

sc 错误状态代码
msg 描述性消息
Throwsjava.io.IOException: 如果发生输入或输出异常
ThrowsIllegalStateException: 如果提交了响应

英文文档：

sendError

void sendError(int sc,
               String msg)
               throws IOException
Sends an error response to the client using the specified status. The server defaults to creating the response to look like an HTML-formatted server error page containing the specified message, setting the content type to "text/html", leaving cookies and other headers unmodified. If an error-page declaration has been made for the web application corresponding to the status code passed in, it will be served back in preference to the suggested msg parameter.

If the response has already been committed, this method throws an IllegalStateException. After using this method, the response should be considered to be committed and should not be written to.

Parameters:
sc - the error status code
msg - the descriptive message
Throws:
IOException - If an input or output exception occurs
IllegalStateException - If the response was committed

public void sendError(int sc) throws java.io.IOException
使用指定状态代码并清除缓冲区将错误响应发送到客户端。

如果已经提交了响应，则此方法抛出 IllegalStateException。使用此方法后，响应应该被视为已经被提交，不能再写入。

sc 错误状态代码
Throwsjava.io.IOException: 如果发生输入或输出异常
ThrowsIllegalStateException: 如果在此方法调用之前提交了响应

英文文档：

sendError

void sendError(int sc)
               throws IOException
Sends an error response to the client using the specified status code and clearing the buffer.

If the response has already been committed, this method throws an IllegalStateException. After using this method, the response should be considered to be committed and should not be written to.

Parameters:
sc - the error status code
Throws:
IOException - If an input or output exception occurs
IllegalStateException - If the response was committed before this method call

public void sendRedirect(String location) throws java.io.IOException
使用指定重定向位置 URL 将临时重定向响应发送到客户端。此方法可以接受相对 URL；servlet 容器必须在将响应发送到客户端之前将相对 URL 转换为绝对 URL。如果位置是相对的，没有前导 '/'，则容器将相对于当前请求 URI 对其进行解释。如果位置是相对的，有一个前导 '/'，则容器将相对于 servlet 容器根对其进行解释。

如果已经提交了响应，则此方法抛出 IllegalStateException。使用此方法后，响应应该被视为已经被提交，不能再写入。

location 重定向位置 URL
Throwsjava.io.IOException: 如果发生输入或输出异常
ThrowsIllegalStateException: 如果提交了响应，或者部分 URL 是给定的且无法将其转换为有效 URL

英文文档：

sendRedirect

void sendRedirect(String location)
                  throws IOException
Sends a temporary redirect response to the client using the specified redirect location URL. This method can accept relative URLs; the servlet container must convert the relative URL to an absolute URL before sending the response to the client. If the location is relative without a leading '/' the container interprets it as relative to the current request URI. If the location is relative with a leading '/' the container interprets it as relative to the servlet container root.

If the response has already been committed, this method throws an IllegalStateException. After using this method, the response should be considered to be committed and should not be written to.

Parameters:
location - the redirect location URL
Throws:
IOException - If an input or output exception occurs
IllegalStateException - If the response was committed or if a partial URL is given and cannot be converted into a valid URL

public void setDateHeader(String name, long date)
用给定名称和日期值设置响应头。该日期根据距历元时间的毫秒数指定。如果已经设置了头，则新值将重写以前的值。containsHeader 方法可用于测试在设置其值之前头是否存在。
name 要设置的头的名称
date 指定的日期值
See also containsHeader, addDateHeader
英文文档：

setDateHeader

void setDateHeader(String name,
                   long date)
Sets a response header with the given name and date-value. The date is specified in terms of milliseconds since the epoch. If the header had already been set, the new value overwrites the previous one. The containsHeader method can be used to test for the presence of a header before setting its value.

Parameters:
name - the name of the header to set
date - the assigned date value
See Also:
containsHeader(java.lang.String), addDateHeader(java.lang.String, long)

public void addDateHeader(String name, long date)
用给定名称和日期值添加响应头。该日期根据距历元时间的毫秒数指定。此方法允许响应头有多个值。
name 要设置的头的名称
date 附加的日期值
See also setDateHeader
英文文档：

addDateHeader

void addDateHeader(String name,
                   long date)
Adds a response header with the given name and date-value. The date is specified in terms of milliseconds since the epoch. This method allows response headers to have multiple values.

Parameters:
name - the name of the header to set
date - the additional date value
See Also:
setDateHeader(java.lang.String, long)

public void setHeader(String name, String value)
用给定名称和值设置响应头。如果已经设置了头，则新值将重写以前的值。containsHeader 方法可用于测试在设置其值之前头是否存在。
name 头的名称
value 头值，如果该值包含八位字节字符串，则应该根据 RFC 2047 (http://www.ietf.org/rfc/rfc2047.txt) 对其进行编码
See also containsHeader, addHeader
英文文档：

setHeader

void setHeader(String name,
               String value)
Sets a response header with the given name and value. If the header had already been set, the new value overwrites the previous one. The containsHeader method can be used to test for the presence of a header before setting its value.

Parameters:
name - the name of the header
value - the header value If it contains octet string, it should be encoded according to RFC 2047 (http://www.ietf.org/rfc/rfc2047.txt)
See Also:
containsHeader(java.lang.String), addHeader(java.lang.String, java.lang.String)

public void addHeader(String name, String value)
用给定名称和值添加响应头。此方法允许响应头有多个值。
name 头的名称
value 附加的头值，如果该值包含八位字节字符串，则应该根据 RFC 2047 (http://www.ietf.org/rfc/rfc2047.txt) 对其进行编码
See also setHeader
英文文档：

addHeader

void addHeader(String name,
               String value)
Adds a response header with the given name and value. This method allows response headers to have multiple values.

Parameters:
name - the name of the header
value - the additional header value If it contains octet string, it should be encoded according to RFC 2047 (http://www.ietf.org/rfc/rfc2047.txt)
See Also:
setHeader(java.lang.String, java.lang.String)

public void setIntHeader(String name, int value)
用给定名称和整数值设置响应头。如果已经设置了头，则新值将重写以前的值。containsHeader 方法可用于测试在设置其值之前头是否存在。
name 头的名称
value 指定的整数值
See also containsHeader, addIntHeader
英文文档：

setIntHeader

void setIntHeader(String name,
                  int value)
Sets a response header with the given name and integer value. If the header had already been set, the new value overwrites the previous one. The containsHeader method can be used to test for the presence of a header before setting its value.

Parameters:
name - the name of the header
value - the assigned integer value
See Also:
containsHeader(java.lang.String), addIntHeader(java.lang.String, int)

public void addIntHeader(String name, int value)
用给定名称和整数值添加响应头。此方法允许响应头有多个值。
name 头的名称
value 指定的整数值
See also setIntHeader
英文文档：

addIntHeader

void addIntHeader(String name,
                  int value)
Adds a response header with the given name and integer value. This method allows response headers to have multiple values.

Parameters:
name - the name of the header
value - the assigned integer value
See Also:
setIntHeader(java.lang.String, int)

public void setStatus(int sc)
设置此响应的状态代码。此方法用于设置没有错误时的返回状态代码（例如状态代码 SC_OK 或 SC_MOVED_TEMPORARILY）。如果有错误，并且调用者希望调用 Web 应用程序中定义的错误页面，则应改用 sendError 方法。

容器清除缓冲区，设置 Location 头，并保留 cookie 和其他头。

sc 状态代码
See also sendError

英文文档：

setStatus

void setStatus(int sc)
Sets the status code for this response. This method is used to set the return status code when there is no error (for example, for the status codes SC_OK or SC_MOVED_TEMPORARILY). If there is an error, and the caller wishes to invoke an error-page defined in the web application, the sendError method should be used instead.

The container clears the buffer and sets the Location header, preserving cookies and other headers.

Parameters:
sc - the status code
See Also:
sendError(int, java.lang.String)

public void setStatus(int sc, String sm)
deprecated 从版本 2.1 起，由于消息参数的含义不明确。使用 setStatus(int) 设置状态代码，使用 sendError(int, String) 发送带描述的错误。 设置此响应的状态代码和消息。
sc 状态代码
sm 状态消息
英文文档：

setStatus

void setStatus(int sc,
               String sm)
Deprecated. As of version 2.1, due to ambiguous meaning of the message parameter. To set a status code use setStatus(int), to send an error with a description use sendError(int, String). Sets the status code and message for this response.

Parameters:
sc - the status code
sm - the status message
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一看就知道只有菜鸟才干这么无知的事啦。

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