今天在jsp上机实验遇到一些问题,从jsp页面转发数据到servlet处理数据的时候出现404错误
代码和目录如下
inputWord.jsp代码:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="word" method=post>
输入英文句子:
<br>
<textArea name="english" rows=5 cols=30></textArea>
<br>
<input type=submit value="提交">
</form>
</body>
</html>
Decompose.java 代码如下:
package myservlet.control;
import java.io.*;
import javax.servlet.*;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.*;
/**
* Servlet implementation class Decompose
*/
@WebServlet(urlPatterns = "/word",name="word")
public class Decompose extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public Decompose() {
super();
}
/**
* @see HttpServlet#init()
*/
public void init(ServletConfig config) throws ServletException{
super.init(config);
}
/**
* @see HttpServlet#service(HttpServletRequest request, HttpServletResponse response)
*/
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
out.println("<html><body bgcolor=yellow>");
String str = request.getParameter("english");
if(str == null || str.length()==0){
return;
}
String[] word = str.split("[^a-zA-Z]+");
int n = 0;
try{
for(int i = 0; i < word.length; i++){
if(word[i].length()>=1){
n++;
out.print("<br>"+word[i]);
}
}
}catch(NumberFormatException e){
out.print(""+e);
}
out.print("<h2>句子中单词数目:"+n);
out.println("</body></html>);
}
}
在查询了一些文章之后 将WEB-INF下的classes文件夹设置好了
但是运行之后依然是404
请教老师后。
是路径的问题。
/word写法是相对路径的写法,书上的代码是将servlet文件放在了web-inf文件夹下,而eclipse是将servlet文件放在java resources文件夹下,因此要采用绝对路径的写法。
“${pageContext.request.contextPath}/word”
该写法可获取项目路径。能访问项目下的资源文件。
用在action里面会去寻找servlet requestMapping是word的servlet。