Java之servlet二

相关类

Servlet
ServletRequest
ServletResponse
HttpServlet
HttpServletRequest
HttpServletResponse
ServletConfig
ServletContext
RequestDispatcher
PrintWriter
HttpSession

Servlet

Method Summary
`void`	`destroy()`
`ServletConfig`	`getServletConfig()`
`java.lang.String`	`getServletInfo()`
`void`	`init(ServletConfig config)`
`void`	`service(ServletRequest req, ServletResponse res)`

ServletRequest

Method Summary
`java.lang.Object`	`getAttribute(java.lang.String name)`
`java.util.Enumeration`	`getAttributeNames()`
`java.lang.String`	`getCharacterEncoding()`
`int`	`getContentLength()`
`java.lang.String`	`getContentType()`
`ServletInputStream`	`getInputStream()`
`java.lang.String`	`getLocalAddr()`
`java.util.Locale`	`getLocale()`
`java.util.Enumeration`	`getLocales()`
`java.lang.String`	`getLocalName()`
`int`	`getLocalPort()`
`java.lang.String`	`getParameter(java.lang.String name)` 获取提交的参数值
`java.util.Map`	`getParameterMap()`
`java.util.Enumeration`	`getParameterNames()`
`java.lang.String[]`	`getParameterValues(java.lang.String name)`
`java.lang.String`	`getProtocol()`
`java.io.BufferedReader`	`getReader()`
`java.lang.String`	`getRealPath(java.lang.String path)`
`java.lang.String`	`getRemoteAddr()`
`java.lang.String`	`getRemoteHost()`
`int`	`getRemotePort()`
`RequestDispatcher`	`getRequestDispatcher(java.lang.String path)`
`java.lang.String`	`getScheme()`
`java.lang.String`	`getServerName()`
`int`	`getServerPort()`
`boolean`	`isSecure()`
`void`	`removeAttribute(java.lang.String name)`
`void`	`setAttribute(java.lang.String name, java.lang.Object o)`
`void`	`setCharacterEncoding(java.lang.String env)`

ServletResponse

Method Summary
`void`	`flushBuffer()`
`int`	`getBufferSize()`
`java.lang.String`	`getCharacterEncoding()` 获取字符编码，如utf-8
`java.lang.String`	`getContentType()` 获取内容类型，如text/html;charset=utf-8
`java.util.Locale`	`getLocale()`
`ServletOutputStream`	`getOutputStream()`
`java.io.PrintWriter`	`getWriter()`
`boolean`	`isCommitted()`
`void`	`reset()`
`void`	`resetBuffer()`
`void`	`setBufferSize(int size)`
`void`	`setCharacterEncoding(java.lang.String charset)` 设置字符编码
`void`	`setContentLength(int len)`
`void`	`setContentType(java.lang.String type)` 设置内容类型
`void`	`setLocale(java.util.Locale loc)`

GenericServlet

Method Summary
`void`	`destroy()`
`java.lang.String`	`getInitParameter(java.lang.String name)` 获取初始化参数名对应的值
`java.util.Enumeration`	`getInitParameterNames()` 获取初始化参数名列表，web.xml中servlet节点中init-param节点信息
`ServletConfig`	`getServletConfig()` 同Servlet
`ServletContext`	`getServletContext()`
`java.lang.String`	`getServletInfo()` 同Servlet，自己实现，保护作者，版权等等
`java.lang.String`	`getServletName()` 获取servlet名，web.xml中servlet节点中servlet-name注册的名称
`void`	`init()`
`void`	`init(ServletConfig config)`
`void`	`log(java.lang.String msg)` 记录在logs文件夹中
`void`	`log(java.lang.String message, java.lang.Throwable t)`
`abstract void`	`service(ServletRequest req, ServletResponse res)`

HttpServlet

Method Summary
`protected void`	`doDelete(HttpServletRequest req, HttpServletResponse resp)`
`protected void`	`doGet(HttpServletRequest req, HttpServletResponse resp)`
`protected void`	`doHead(HttpServletRequest req, HttpServletResponse resp)`
`protected void`	`doOptions(HttpServletRequest req, HttpServletResponse resp)`
`protected void`	`doPost(HttpServletRequest req, HttpServletResponse resp)`
`protected void`	`doPut(HttpServletRequest req, HttpServletResponse resp)`
`protected void`	`doTrace(HttpServletRequest req, HttpServletResponse resp)`
`protected long`	`getLastModified(HttpServletRequest req)`
`protected void`	`service(HttpServletRequest req, HttpServletResponse resp)`
`void`	`service(ServletRequest req, ServletResponse res)`

HttpServletRequest

Method Summary
`java.lang.String`	`getAuthType()`
`java.lang.String`	`getContextPath()`
`Cookie[]`	`getCookies()`
`long`	`getDateHeader(java.lang.String name)`
`java.lang.String`	`getHeader(java.lang.String name)`
`java.util.Enumeration`	`getHeaderNames()`
`java.util.Enumeration`	`getHeaders(java.lang.String name)`
`int`	`getIntHeader(java.lang.String name)`
`java.lang.String`	`getMethod()`
`java.lang.String`	`getPathInfo()`
`java.lang.String`	`getPathTranslated()`
`java.lang.String`	`getQueryString()`
`java.lang.String`	`getRemoteUser()`
`java.lang.String`	`getRequestedSessionId()`
`java.lang.String`	`getRequestURI()`
`java.lang.StringBuffer`	`getRequestURL()`
`java.lang.String`	`getServletPath()`
`HttpSession`	`getSession()`
`HttpSession`	`getSession(boolean create)`
`java.security.Principal`	`getUserPrincipal()`
`boolean`	`isRequestedSessionIdFromCookie()`
`boolean`	`isRequestedSessionIdFromUrl()` Deprecated. As of Version 2.1 of the Java Servlet API, use `isRequestedSessionIdFromURL()` instead.
`boolean`	`isRequestedSessionIdFromURL()`
`boolean`	`isRequestedSessionIdValid()`
`boolean`	`isUserInRole(java.lang.String role)`

HttpServletResponse

Method Summary
`void`	`addCookie(Cookie cookie)`
`void`	`addDateHeader(java.lang.String name, long date)`
`void`	`addHeader(java.lang.String name, java.lang.String value)` 设置回复消息行键值
`void`	`addIntHeader(java.lang.String name, int value)`
`boolean`	`containsHeader(java.lang.String name)`
`java.lang.String`	`encodeRedirectUrl(java.lang.String url)` Deprecated. As of version 2.1
`java.lang.String`	`encodeRedirectURL(java.lang.String url)`
`java.lang.String`	`encodeUrl(java.lang.String url)` Deprecated. As of version 2.1
`java.lang.String`	`encodeURL(java.lang.String url)`
`void`	`sendError(int sc)`
`void`	`sendError(int sc, java.lang.String msg)`
`void`	`sendRedirect(java.lang.String location)` 重定向
`void`	`setDateHeader(java.lang.String name, long date)`
`void`	`setHeader(java.lang.String name, java.lang.String value)`
`void`	`setIntHeader(java.lang.String name, int value)`
`void`	`setStatus(int sc)`
`void`	`setStatus(int sc, java.lang.String sm)` Deprecated As of version 2.1

ServletConfig

Method Summary
`java.lang.String`	`getInitParameter(java.lang.String name)`
`java.util.Enumeration`	`getInitParameterNames()`
`ServletContext`	`getServletContext()`
`java.lang.String`	`getServletName()`

ServletContext

Method Summary
`java.lang.Object`	`getAttribute(java.lang.String name)`
`java.util.Enumeration`	`getAttributeNames()`
`ServletContext`	`getContext(java.lang.String uripath)`
`java.lang.String`	`getInitParameter(java.lang.String name)`
`java.util.Enumeration`	`getInitParameterNames()`
`int`	`getMajorVersion()`
`java.lang.String`	`getMimeType(java.lang.String file)`
`int`	`getMinorVersion()`
`RequestDispatcher`	`getNamedDispatcher(java.lang.String name)`
`java.lang.String`	`getRealPath(java.lang.String path)` 将资源相对路径转换成系统绝对路径
`RequestDispatcher`	`getRequestDispatcher(java.lang.String path)`
`java.net.URL`	`getResource(java.lang.String path)`
`java.io.InputStream`	`getResourceAsStream(java.lang.String path)` 将资源转换成输入流
`java.util.Set`	`getResourcePaths(java.lang.String path)`
`java.lang.String`	`getServerInfo()`
`Servlet`	`getServlet(java.lang.String name)` Deprecated. As of Java Servlet API 2.1
`java.lang.String`	`getServletContextName()`
`java.util.Enumeration`	`getServletNames()` Deprecated. As of Java Servlet API 2.1
`java.util.Enumeration`	`getServlets()` Deprecated. As of Java Servlet API 2.0
`void`	`log(java.lang.Exception exception, java.lang.String msg)` Deprecated. As of Java Servlet API 2.1
`void`	`log(java.lang.String msg)`
`void`	`log(java.lang.String message, java.lang.Throwable throwable)`
`void`	`removeAttribute(java.lang.String name)`
`void`	`setAttribute(java.lang.String name, java.lang.Object object)`

RequestDispatcher

Method Summary
`void`	`forward(ServletRequest request, ServletResponse response)` 转发
`void`	`include(ServletRequest request, ServletResponse response)`

PrintWriter

HttpSession

线程同步

synchronized(this){
    iNum++;
    res.getWriter().println(iNum);
}

重定向和转发

重定向HttpServletResponse.sendRedirect

转发RequestDispatcher.forward

同：都是跳转到另外一个资源，不能有PrintWriter输出到客户端

异：重定向可以跳转到任意的url，有两次请求（表现为有两次请求和回复，且浏览器中url为最后一个请求的url）

转发只能跳转到同一Web应用下其他资源路径下，只有一次请求（表现为有一次请求和回复，且浏览器中url开始请求的url）

附录

Servlet API文档

相关类