您所在位置：主题：[讨论]上传图片问题
huangwulin
[专家分：0] 发布于 2010-12-20 23:36:00
在上传图片的时候遇到了一些问题，问题如上传的图片,相片可以上传到F：\inmage下，但是就是不能在页面上显示。请大侠们帮帮忙。
package mybean.data;
UploadFile.java:
public class UploadFile {
String fileName;
String savedFileName;
String backNews="";
public void setFileName(String fname) {
fileName = fname;
}
public String getFileName() {
return fileName;
}
public String getSavedFileName() {
return savedFileName;
}
public void setSavedFileName(String savedFileName) {
this.savedFileName = savedFileName;
}
public String getBackNews() {
return backNews;
}
public void setBackNews(String backNews) {
this.backNews = backNews;
}
}
HandleUpload.java:
package myservlet.control;
import mybean.data.*;
import java.sql.*;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class HandleUpload extends HttpServlet {
public void init(ServletConfig config) throws ServletException {
super.init(config);
try {
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
} catch (Exception e) {
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
HttpSession session = request.getSession(true);
Login login = (Login) session.getAttribute("login"); // 获取用户登录时的Javabean
boolean ok = true;
if (login == null) {
ok = false;
response.sendRedirect("login.jsp"); // 重定向到登录页面
}
if (ok == true) {
String username = login.getUsername();
uploadFileMethod(request, response, username); // 接受上传文件
}
}
public void uploadFileMethod(HttpServletRequest request,
HttpServletResponse response, String username)
throws ServletException, IOException {
UploadFile upFile = new UploadFile();
String backNews = "";
try {
HttpSession session = request.getSession(true);
request.setAttribute("upFile", upFile);
String tempFileName = (String) session.getId();
File f1 = new File(tempFileName);
FileOutputStream o = new FileOutputStream(f1);
InputStream in = request.getInputStream();
byte b[] = new byte[10000];
int n;
while ((n = in.read(b)) != -1) {
o.write(b, 0, n);
}
o.close();
in.close();
RandomAccessFile random = new RandomAccessFile(f1, "r");
int second = 1; // 读出f1的第2行，析取出上传文件的名字：
String secondLine = null;
while (second <= 2) {
secondLine = random.readLine();
second++;
}
int position = secondLine.lastIndexOf('\\'); // 获取第2行中目录符号'\'最后出现的位置
String fileName = secondLine.substring(position + 1, secondLine.length() - 1); // 截取文件名
byte cc[] = fileName.getBytes("ISO-8859-1");
fileName = new String(cc);
//request.setAttribute("upFile", upFile);
fileName = fileName.replaceAll(" ", "");
// 文件是否由字母或数字组成判断名字
String checkedStr = fileName.substring(0, fileName.indexOf("."));
boolean isLetterOrDigit = true;
for (int i = 0; i < checkedStr.length(); i++) {
char c = checkedStr.charAt(i);
if (!((c <= 'z' && c >= 'a') || (c <= 'Z' && c >= 'A') || (c <= '9' && c >= '0'))) {
isLetterOrDigit = false;
break;
}
}
if (isLetterOrDigit == false) {
response.sendRedirect("upload.jsp"); // 重定向到upload.jsp页面
}
// 保存文件名是上传文件名加会员名为前缀:
String savedFileName = username.concat(fileName);
random.seek(0);
long forthEndPosition = 0; // 获取第4行回车符号的位置
int forth = 1;
while ((n = random.readByte()) != -1 && (forth <= 4)) {
if (n == '\n') {
forthEndPosition = random.getFilePointer();
forth++;
}
}
// 根据客户上传文件的名字，将该文件存入磁盘
File dir = new File("F:/image");
dir.mkdir();
// 首先删除用户曾上传过的图像文件：
File file[] = dir.listFiles();
for (int k = 0; k < file.length; k++) {
if (file[k].getName().startsWith(username))
file[k].delete();
}
File savingFile = new File(dir, savedFileName); // 需要新保存的上传文件
RandomAccessFile random2 = new RandomAccessFile(savingFile, "rw");
random.seek(random.length());
long endPosition = random.getFilePointer();
long mark = endPosition;
int j = 1;
// 确定出文件f1中包含客户上传的文件的内容的最后位置，即倒数第6行:
while ((mark >= 0) && (j <= 6)) {
mark--;
random.seek(mark);
n = random.readByte();
if (n == '\n') {
endPosition = random.getFilePointer();
j++;
}
}
random.seek(forthEndPosition);
long startPoint = random.getFilePointer();
while (startPoint<endPosition-1) {
n = random.readByte();
random2.write(n);
startPoint = random.getFilePointer();
}
random2.close();
random.close();
String uri = "jdbc:sqlserver://127.0.0.1:1433;DatabaseName=memberInfo";
Connection con = DriverManager.getConnection(uri, "sa", "123456");
Statement sql = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
ResultSet rs = sql.executeQuery("SELECT * FROM member where username = '"+ username + "'");
if (rs.next()) {
if (isLetterOrDigit) {
rs.updateString(8, savedFileName);
int index = rs.getRow();
rs.absolute(index);
rs.updateRow();
backNews = fileName + "成功上传";
upFile.setFileName(fileName);
upFile.setSavedFileName(savedFileName);
upFile.setBackNews(backNews);
}
}
con.close();
f1.delete();
} catch (Exception exp) {
backNews = "" + exp;
upFile.setBackNews(backNews);
}
try {
RequestDispatcher dispatcher = request
.getRequestDispatcher("/showUploadMess.jsp");
dispatcher.forward(request, response);
} catch (Exception ee) {
}
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
}
upload.jsp:
<%@ page contentType="text/html; charset=GB2312" language="java" import="java.sql.*"%>
<html>
<body>
<center>
<P>文件将被上传到 F:\image中。
<p>选择要上传的图片文件（名字不可以含有非ASCII码字符，比如汉字等）:
<FORM action="helpUpload" method="post" ENCTYPE="multipart/form-data">
<input type=FILE name="fileName" size="40">
<input type="submit" name="g" value="提交">
</FORM>
</center>
</body>
</html>
showUploadMess.jsp:
<%@ page contentType="text/html; charset=GB2312" language="java" import="java.sql.*"%>
<%@ page import="mybean.data.UploadFile"%>
<jsp:useBean id="upFile" type="mybean.data.UploadFile" scope="request" />
<html>
<body>
<center>
<font size="4">
<jsp:getProperty property="backNews" name="upFile"/>
</font>
<font size="2">上传文件的名字：<jsp:getProperty property="fileName" name="upFile"/>
保存后的文件名字：<jsp:getProperty property="savedFileName" name="upFile"/>
<IMG src=image/<jsp:getProperty property="savedFileName" name="upFile"/>
width=100 height=100/>图片效果
</IMG>
</font>
</center>
</body>
</html>
package mybean.data;
UploadFile.java:
public class UploadFile {
String fileName;
String savedFileName;
String backNews="";
public void setFileName(String fname) {
fileName = fname;
}
public String getFileName() {
return fileName;
}
public String getSavedFileName() {
return savedFileName;
}
public void setSavedFileName(String savedFileName) {
this.savedFileName = savedFileName;
}
public String getBackNews() {
return backNews;
}
public void setBackNews(String backNews) {
this.backNews = backNews;
}
}
HandleUpload.java:
package myservlet.control;
import mybean.data.*;
import java.sql.*;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class HandleUpload extends HttpServlet {
public void init(ServletConfig config) throws ServletException {
super.init(config);
try {
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
} catch (Exception e) {
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
HttpSession session = request.getSession(true);
Login login = (Login) session.getAttribute("login"); // 获取用户登录时的Javabean
boolean ok = true;
if (login == null) {
ok = false;
response.sendRedirect("login.jsp"); // 重定向到登录页面
}
if (ok == true) {
String username = login.getUsername();
uploadFileMethod(request, response, username); // 接受上传文件
}
}
public void uploadFileMethod(HttpServletRequest request,
HttpServletResponse response, String username)
throws ServletException, IOException {
UploadFile upFile = new UploadFile();
String backNews = "";
try {
HttpSession session = request.getSession(true);
request.setAttribute("upFile", upFile);
String tempFileName = (String) session.getId();
File f1 = new File(tempFileName);
FileOutputStream o = new FileOutputStream(f1);
InputStream in = request.getInputStream();
byte b[] = new byte[10000];
int n;
while ((n = in.read(b)) != -1) {
o.write(b, 0, n);
}
o.close();
in.close();
RandomAccessFile random = new RandomAccessFile(f1, "r");
int second = 1; // 读出f1的第2行，析取出上传文件的名字：
String secondLine = null;
while (second <= 2) {
secondLine = random.readLine();
second++;
}
int position = secondLine.lastIndexOf('\\'); // 获取第2行中目录符号'\'最后出现的位置
String fileName = secondLine.substring(position + 1, secondLine.length() - 1); // 截取文件名
byte cc[] = fileName.getBytes("ISO-8859-1");
fileName = new String(cc);
//request.setAttribute("upFile", upFile);
fileName = fileName.replaceAll(" ", "");
// 文件是否由字母或数字组成判断名字
String checkedStr = fileName.substring(0, fileName.indexOf("."));
boolean isLetterOrDigit = true;
for (int i = 0; i < checkedStr.length(); i++) {
char c = checkedStr.charAt(i);
if (!((c <= 'z' && c >= 'a') || (c <= 'Z' && c >= 'A') || (c <= '9' && c >= '0'))) {
isLetterOrDigit = false;
break;
}
}
if (isLetterOrDigit == false) {
response.sendRedirect("upload.jsp"); // 重定向到upload.jsp页面
}
// 保存文件名是上传文件名加会员名为前缀:
String savedFileName = username.concat(fileName);
random.seek(0);
long forthEndPosition = 0; // 获取第4行回车符号的位置
int forth = 1;
while ((n = random.readByte()) != -1 && (forth <= 4)) {
if (n == '\n') {
forthEndPosition = random.getFilePointer();
forth++;
}
}
// 根据客户上传文件的名字，将该文件存入磁盘
File dir = new File("F:/image");
dir.mkdir();
// 首先删除用户曾上传过的图像文件：
File file[] = dir.listFiles();
for (int k = 0; k < file.length; k++) {
if (file[k].getName().startsWith(username))
file[k].delete();
}
File savingFile = new File(dir, savedFileName); // 需要新保存的上传文件
RandomAccessFile random2 = new RandomAccessFile(savingFile, "rw");
random.seek(random.length());
long endPosition = random.getFilePointer();
long mark = endPosition;
int j = 1;
// 确定出文件f1中包含客户上传的文件的内容的最后位置，即倒数第6行:
while ((mark >= 0) && (j <= 6)) {
mark--;
random.seek(mark);
n = random.readByte();
if (n == '\n') {
endPosition = random.getFilePointer();
j++;
}
}
random.seek(forthEndPosition);
long startPoint = random.getFilePointer();
while (startPoint<endPosition-1) {
n = random.readByte();
random2.write(n);
startPoint = random.getFilePointer();
}
random2.close();
random.close();
String uri = "jdbc:sqlserver://127.0.0.1:1433;DatabaseName=memberInfo";
Connection con = DriverManager.getConnection(uri, "sa", "123456");
Statement sql = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
ResultSet rs = sql.executeQuery("SELECT * FROM member where username = '"+ username + "'");
if (rs.next()) {
if (isLetterOrDigit) {
rs.updateString(8, savedFileName);
int index = rs.getRow();
rs.absolute(index);
rs.updateRow();
backNews = fileName + "成功上传";
upFile.setFileName(fileName);
upFile.setSavedFileName(savedFileName);
upFile.setBackNews(backNews);
}
}
con.close();
f1.delete();
} catch (Exception exp) {
backNews = "" + exp;
upFile.setBackNews(backNews);
}
try {
RequestDispatcher dispatcher = request
.getRequestDispatcher("/showUploadMess.jsp");
dispatcher.forward(request, response);
} catch (Exception ee) {
}
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
}
upload.jsp:
<%@ page contentType="text/html; charset=GB2312" language="java" import="java.sql.*"%>
<html>
<body>
<center>
<P>文件将被上传到 F:\image中。
<p>选择要上传的图片文件（名字不可以含有非ASCII码字符，比如汉字等）:
<FORM action="helpUpload" method="post" ENCTYPE="multipart/form-data">
<input type=FILE name="fileName" size="40">
<input type="submit" name="g" value="提交">
</FORM>
</center>
</body>
</html>
showUploadMess.jsp:
<%@ page contentType="text/html; charset=GB2312" language="java" import="java.sql.*"%>
<%@ page import="mybean.data.UploadFile"%>
<jsp:useBean id="upFile" type="mybean.data.UploadFile" scope="request" />
<html>
<body>
<center>
<font size="4">
<jsp:getProperty property="backNews" name="upFile"/>
</font>
<font size="2">上传文件的名字：<jsp:getProperty property="fileName" name="upFile"/>
保存后的文件名字：<jsp:getProperty property="savedFileName" name="upFile"/>
<IMG src=image/<jsp:getProperty property="savedFileName" name="upFile"/>
width=100 height=100/>图片效果
</IMG>
</font>
</center>
</body>
</html>