(1)(考察知识点HttpServletRequest对象的应用) 完成解决请求参数的中文乱码问题任务代码的编写。 (2)(考察知识点请求转发) 请按照以下要求编写程序: 1)编写一个名称为ForwardServlet的Servlet类,在类中向request对象中增加一些信息(班级和姓名),然后使用forward()方法将请求转发到ResultServlet类中。 2)编写一个名称为ResultServlet的Servlet类,在类中获取request对象中增加的信息并输出。 3)在web.xml中添加完两个Servlet的映射后,启动服务器,使用浏览器访问ForwardServlet,查看显示结果。
时间: 2024-02-29 16:55:26 浏览: 112
完美解决Get和Post请求中文乱码的问题
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以下是您需要的代码实现:
ForwardServlet.java:
```
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ForwardServlet extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// 设置请求编码格式为UTF-8
request.setCharacterEncoding("UTF-8");
// 向request对象中增加一些信息
request.setAttribute("class", "计算机科学与技术");
request.setAttribute("name", "张三");
// 请求转发到ResultServlet类中
request.getRequestDispatcher("/ResultServlet").forward(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
```
ResultServlet.java:
```
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ResultServlet extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// 获取request对象中增加的信息
String classInfo = (String) request.getAttribute("class");
String nameInfo = (String) request.getAttribute("name");
// 输出信息
response.setContentType("text/html;charset=UTF-8");
response.getWriter().write("<h1>班级:" + classInfo + "</h1>");
response.getWriter().write("<h1>姓名:" + nameInfo + "</h1>");
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
```
web.xml:
```
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
id="WebApp_ID" version="3.0">
<servlet>
<servlet-name>ForwardServlet</servlet-name>
<servlet-class>ForwardServlet</servlet-class>
</servlet>
<servlet>
<servlet-name>ResultServlet</servlet-name>
<servlet-class>ResultServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ForwardServlet</servlet-name>
<url-pattern>/ForwardServlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>ResultServlet</servlet-name>
<url-pattern>/ResultServlet</url-pattern>
</servlet-mapping>
</web-app>
```
请将以上代码保存在对应的Java文件中,并部署到Tomcat服务器中。访问http://localhost:8080/ForwardServlet,应该能够看到输出结果。
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