新手问个servlet小疑点
日期：2014-05-17 浏览次数：20668 次
新手问个servlet小问题 求高手指教
代码 ：
package com.login.servlet;
import javax.servlet.http.*;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import java.io.*;
public class HelloServlet extends HttpServlet {
public void init ( ServletConfig config ) throws ServletException{
super.init(config);
}
public void doGet(HttpServletRequest req,
HttpServletResponse resp)
throws ServletException, IOException {
resp.setContentType("text/html;charset=GB2312");
System.out.println("<html>");
System.out.println("<head><title>CN2=HelloServlet</title><head>");
System.out.println("<body>");
System.out.println("hello XXXXX <br>");
System.out.println("大家好");
System.out.println("</body>");
System.out.println("</html>");
System.out.close();
}
public String getServletInfo(){
return "com.login.servlet Information";
}
public void destory(){}
}
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>HelloServlet</servlet-name>
<servlet-class>com.login.servlet.HelloServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HelloServlet</servlet-name>
<url-pattern>/HelloServlet</url-pattern>
</servlet-mapping>
</web-app>
浏览器打开窗口:http://localhost:8080\Hello_Web\HelloServlet
页面为什么是空白的。但Console下输出这个：
<html>
<head><title>CN2=HelloServlet</title><head>
<body>
hello XXXXX <br>
大家好
</body>
</html>
------解决方案--------------------
输出到网页用 PrintWrite 而不是用system.out
代码 ：
package com.login.servlet;
import javax.servlet.http.*;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import java.io.*;
public class HelloServlet extends HttpServlet {
public void init ( ServletConfig config ) throws ServletException{
super.init(config);
}
public void doGet(HttpServletRequest req,
HttpServletResponse resp)
throws ServletException, IOException {
resp.setContentType("text/html;charset=GB2312");
System.out.println("<html>");
System.out.println("<head><title>CN2=HelloServlet</title><head>");
System.out.println("<body>");
System.out.println("hello XXXXX <br>");
System.out.println("大家好");
System.out.println("</body>");
System.out.println("</html>");
System.out.close();
}
public String getServletInfo(){
return "com.login.servlet Information";
}
public void destory(){}
}
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>HelloServlet</servlet-name>
<servlet-class>com.login.servlet.HelloServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HelloServlet</servlet-name>
<url-pattern>/HelloServlet</url-pattern>
</servlet-mapping>
</web-app>
浏览器打开窗口:http://localhost:8080\Hello_Web\HelloServlet
页面为什么是空白的。但Console下输出这个：
<html>
<head><title>CN2=HelloServlet</title><head>
<body>
hello XXXXX <br>
大家好
</body>
</html>
------解决方案--------------------
输出到网页用 PrintWrite 而不是用system.out
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