2-6自由编程
为什么在返回答案的时候会出现乱码？
这是答案返回Servlet类：daanfanhui.java
package com.winking.ServletProj.change;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class daanfanhui
*/
@WebServlet("/mun")
public class daanfanhui extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public daanfanhui() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
int mun=(int)request.getAttribute("reqn");
response.getWriter().println("这是累加的和："+mun);
response.setContentType("text/html;charset=utf-8");
}
}这是请求获取Servlet：getnum.java
package com.winking.ServletProj.change;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class getnum
*/
@WebServlet("/get")
public class getnum extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public getnum() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String n =request.getParameter("n");
int a=Integer.parseInt(n);
int i=0;
int umn=0;
while(i<=a) {
umn=umn+i;
i++;
}
request.setAttribute("reqn", umn);
request.getRequestDispatcher("/mun").forward(request, response);
}
}这是html的代码：computer.html
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> </head> <body> <form action="http://localhost:8080/FirstServlet/get"> <input type="text" name="n" "/> <input type="submit" value="求累加和"/> </form> </body> </html>
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1回答
同学你好，这是因为在使用request和response进行请求响应的数据传递的时候，没有注意编码格式，我们可以添加如下两条语句：
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");这样就可以限定web服务器输入的请求流、输出的响应流的编码都为UTF-8了，这些内容在后面的课程中都会讲解的哦，添加如上代码后，运行效果如下：
如果我的回答解决了你的疑惑，请采纳，祝学习愉快~
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