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
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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
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<?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：
