HelloServlet类继承HttpServlet利用HttpServletResponse对象
HelloServlet类的doGet()方法先得到username请求参数,对其进行中文字符编码转换,然后判断username是否为空,如果为空就返回403响应状态代码,否则就通过HttpServletResponse对象的getWriter()方法得到一个PrinterWriter对象,然后通过PrintWriter对象来输出HTML文档
HelloServlet.java
package com.demo.servlet;
import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.io.PrintWriter; /* Created by 谭雪娇 on 2017/4/5. */ public class HelloServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException,IOException{ //获得sername的请求参数 String username=request.getParameter("username"); /*字符编码转换 * HTTP请求的默认字符编码为ISO-8859-1,如果请求中包含中文需要把它转换为GB2312中文编码。*/ if(username!=null){ username=new String(username.getBytes("ISO-8859-1"),"UTF-8"); if(username==null){ response.sendError(response.SC_FORBIDDEN); return; } //设置HTTP响应的正文的MIME类型及字符编码 response.setContentType("text/html;charset=UTF-8"); /*输出HTML文档*/ PrintWriter out=response.getWriter(); out.println("<html><head><title>HelloServlet</title><head>"); out.println("<body>"); out.println("你好:"+username); out.println("</body></html>"); System.out.println("before close():"+response.isCommitted()); out.close(); System.out.println("before close():"+response.isCommitted()); } } }
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web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1"> <context-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/applicationContext.xml</param-value> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <servlet> <servlet-name>dispatcher</servlet-name> <servlet-class>com.demo.servlet.RequestInfoServlet</servlet-class>
</servlet> <servlet-mapping> <servlet-name>dispatcher</servlet-name> <url-pattern>/info</url-pattern> </servlet-mapping> <servlet> <servlet-name>dispatcher1</servlet-name> <servlet-class>com.demo.servlet.HelloServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>dispatcher1</servlet-name> <url-pattern>/hello</url-pattern> </servlet-mapping> </web-app>
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运行结果
Tomcat所在控制台结果
浏览器结果:
标签:username,http,name,HttpServletResponse,HttpServlet,out,servlet,class,HelloServle
来源: https://blog.51cto.com/u_11462036/2794950