web编程的乱码问题
[code=HTML][/code]我重新编辑了一个东西，是页面转移的，由AddServlet.java,BookWriter.java,Book.java,hello.jsp源代码按顺序如下
- Java code
package jp.bcat;import java.io.*;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.*;import java.text.SimpleDateFormat;import java.util.Date;/** * Servlet implementation class AddServlet */@WebServlet("/AddServlet")public class AddServlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub String step = request.getParameter("step"); if ("prepare".equals(step)) prepare(request, response); } void prepare(HttpServletRequest request, HttpServletResponse response) throws IOException { String errorMessage = ""; Book book = new Book(); String title = request.getParameter("title"); book.setTitle(title); if (title == null || title.length() == 0) errorMessage += "<P>タイトルを入力してください。</P>"; response.setContentType("text/html; charset=utf-8"); PrintWriter out = response.getWriter(); out.println("<HTML><HEAD><TITLE>登</TITLE></HEAD>"); if (errorMessage.length() == 0) { out.println("<BODY>"); out.println("<PRE>"); new BookWriter(out, "+ ").write(book); out.println("</PRE>"); out.println("</BODY>"); } out.println("</HTML>"); }}- Java code
package jp.bcat;import java.io.PrintWriter;public class BookWriter { protected PrintWriter out; protected String indent; public BookWriter(PrintWriter out, String indent) { this.out = out; this.indent = indent; } public void write(Book book) { out.println(indent + "タイトル: " + book.getTitle()); }}- Java code
package jp.bcat;import java.io.Serializable;public class Book implements Serializable { protected String title; public String getTitle() { return title; } public void setTitle(String value) { title = value; }}- HTML code
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="windows-31j"%><!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="AddServlet" method="POST"> <TABLE> <TR><TD>タイトル: </TD><TD><INPUT name="title"></TD></TR> <TR><TD><INPUT type="submit" value="登"></TD></TR> <INPUT type="hidden" name="step" value="prepare"> </TABLE> </FORM></body></html>
如果输入汉字，显示的是？？？？的乱码。
我估计我好像是Filter的设置好像不对，我的Filter的代码如下，如何在程序中使用这个过滤器呢？请高手们帮助，谢谢大家了。
- Java code
package jp.bcat.util;import java.io.IOException;import javax.servlet.*;public class RequestEncodingFilter implements Filter { private String encoding; public void init(FilterConfig config) throws ServletException { encoding = config.getInitParameter("encoding"); } public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException { if (encoding != null) req.setCharacterEncoding(encoding); chain.doFilter(req, res); } public void destroy() { }}[解决办法]
jsp页面的charset的值改成gbk就行了
[解决办法]
AddServlet 加个中文转换
package jp.bcat;
import java.io.*;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.*;
import java.text.SimpleDateFormat;
import java.util.Date;
/**
* Servlet implementation class AddServlet
*/
@WebServlet("/AddServlet")
public class AddServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
String step = request.getParameter("step");
if ("prepare".equals(step))
prepare(request, response);
}
void prepare(HttpServletRequest request, HttpServletResponse response) throws IOException {
String errorMessage = "";
Book book = new Book();
String title = request.getParameter("title");
if(title.trim!=null){
String temTitle = new String(title .getBytes("ISO-8859-1"),"GB2312");
book.setTitle(temTitle);
}else{
book.setTitle("");
}
if (title == null || title.length() == 0)
errorMessage += "<P>タイトルを入力してください。</P>";
response.setContentType("text/html; charset=utf-8");
PrintWriter out = response.getWriter();
out.println("<HTML><HEAD><TITLE>登</TITLE></HEAD>");
if (errorMessage.length() == 0) {
out.println("<BODY>");
out.println("<PRE>");
new BookWriter(out, "+ ").write(book);
out.println("</PRE>");
out.println("</BODY>");
}
out.println("</HTML>");
}
}
new String(iso.getBytes("ISO-8859-1"),"GB2312");
[解决办法]
encoding = config.getInitParameter("encoding");
web.xml里面是怎么配置的这个参数？
[解决办法]
<init-param>
<param-name>encoding</param-name>
<param-value>Shift_JIS</param-value>
</init-param>
Shift_JIS改为utf-8试试