Java 如何在jsp中使用md5比较两个输入文件？
如何使用md5算法比较html或jsp中的两个txt或pdf文件？请把密码寄出去Java 如何在jsp中使用md5比较两个输入文件？,java,jsp,md5,Java,Jsp,Md5,如何使用md5算法比较html或jsp中的两个txt或pdf文件？请把密码寄出去 <%@ page contentType="text/html; charset=utf-8" language="java" import="java.sql.*" errorPage="" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtm
<%@ page contentType="text/html; charset=utf-8" language="java" import="java.sql.*" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>
<body>
<form method=post action="nextpage.jsp">
<h3>Select File 1:</h3><input type="file" name="fileName1" id="file1">
<h3>Select File 2:</h3><input type="file" name="fileName2" id="file2">
<br>
<br>
<input type="button" name="Compare" value="Compare">
</form>
</body>
</html>
无标题文件
选择文件1：
选择文件2：
<%@ page contentType="text/html; charset=utf-8" language="java" import="java.sql.*" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>
<body>
<%= request.getParameter("fileName1") %>
<%= request.getParameter("fileName2") %>
</body>
</html>
无标题文件
public String msgDigest(String fname)throws Exception
{
MessageDigest md = MessageDigest.getInstance("MD5");
FileInputStream fis = new FileInputStream(fname);
byte[] dataBytes = new byte[1024];
int nread = 0;
while ((nread = fis.read(dataBytes)) != -1)
{
md.update(dataBytes, 0, nread);
};
byte[] mdbytes = md.digest();
//convert the byte to hex format method 1
StringBuffer sb = new StringBuffer();
for (int i = 0; i < mdbytes.length; i++)
{
sb.append(Integer.toString((mdbytes[i] & 0xff) + 0x100, 16).substring(1));
}
String result= sb.toString();
return result;
}
公共字符串msgDigest（字符串fname）引发异常
{
MessageDigest md=MessageDigest.getInstance（“MD5”）；
FileInputStream fis=新的FileInputStream（fname）；
字节[]数据字节=新字节[1024]；
int nread=0；
而（（nread=fis.read（数据字节））！=-1）
{
md.update（数据字节，0，nread）；
};
byte[]mdbytes=md.digest（）；
//将字节转换为十六进制格式方法1
StringBuffer sb=新的StringBuffer（）；
对于（int i=0；i如何比较两个文件？我建议您在处理表单输入的servlet中使用Commons FileUpload。以下是示例教程：。完成后，只需分派到另一个jsp
您是否需要代码示例？我做了一个项目，检查两个文件的md5并向您显示结果。这是密码 servlet的代码：
@WebServlet("/upload")
@MultipartConfig
public class Md5ServletProcessor extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String md5ForFirstFile = getMd5String(request, "file1");
String md5ForSecondFile = getMd5String(request, "file2");
response.sendRedirect("result.jsp?file1Md5="+md5ForFirstFile+"&file2Md5="+md5ForSecondFile+"&filesEqual="+md5ForFirstFile.equals(md5ForSecondFile));
}
private String getMd5String(HttpServletRequest request, String parameter) throws ServletException, IOException{
Part filePart = request.getPart(parameter);
InputStream is = filePart.getInputStream();
return DigestUtils.md5Hex(is);
}
}
<%@page contentType="text/html" 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>Java MD5CheckSum</title>
</head>
<body>
<div>
<h3> Choose Two Files for MD5CheckSum : </h3>
<form action="upload" method="post" enctype="multipart/form-data">
<table>
<tr>
<th>File 1:</th>
<td><input type="file" name="file1" /></td>
</tr>
<tr>
<th>File 2:</th>
<td> <input type="file" name="file2" /></td>
</tr>
</table>
<input type="submit" value="upload" />
</form>
</div>
</body>
</html>
Java MD5CheckSum
为MD5CheckSum选择两个文件：
文件1：
文件2：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!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>Md5Checksum Result</title>
</head>
<body>
<table>
<tr>
<th colspan="2">THE RESULT OF COMPARING TWO FILE IS:</th>
</tr>
<tr><th colspan="2"></th></tr>
<tr>
<th>File1 Md5:</th>
<td>${param.file1Md5}</td>
</tr>
<tr>
<th>File2 Md5:</th>
<td>${param.file2Md5}</td>
</tr>
<tr>
<th>result</th>
<td><c:if test="${param.filesEqual}">
<span style="color: green">These two files are equal</span>
</c:if> <c:if test="${!param.filesEqual}">
<span style="color: red">These two files are not equal</span>
</c:if></td>
</tr>
<tr>
<th colspan="2"><a href="." >go back</a></th>
</tr>
</table>
</body>
</html>
Md5Checksum结果
比较两个文件的结果是：
文件1 Md5：
${param.file1Md5}
文件2 Md5：
${param.file2Md5}
结果
这两个文件相等
这两个文件不相等
祝你好运 告诉我们
nextpage.jsp