在jsp中显示图像

您好我正在jsp中创建一个网页，我必须从一个路径显示图像，这是我存储我的图像的文件夹。但是当我运行该文件时，我只看到路径名称，但图像没有显示。任何人都可以通过下面的代码来帮助我。在jsp中显示图像

代码：

<%@page import="java.io.*"%> 
<html> 
<body> 

<table> 
<% 
File f = new File("C:/UploadedFiles"); 
File[] files = f.listFiles(); 
for(int i=0;i<files.length;i++){ 
String name=files[i].getName(); 
String path=files[i].getPath(); 

%> 
<tr> 
<td><img src="<%=path=name%>"/></a></td> 
</tr> 
<% 
} 
%> 
</table> 
</body> 
</html>

来源

2012-07-23 prakash_d22

哪来的文件名？你只是给图像路径，即使你没有启动一个锚标记之前标签 – 2012-07-23 05:23:17

我认为你必须输入完整路径... – 2012-07-23 05:26:56

你能告诉我怎么做？ @约翰 – 2012-07-23 05:29:52

您可以使用路径，如：

File f = new File("C:/UploadedFiles/abc.jpg");

相反书面方式

File f = new File("C:/UploadedFiles");

您只使用文件路径的需要的文件夹的路径而不是图像。

来源

2012-07-23 05:28:25

如果我想使用多个图像怎么办... – 2012-07-23 05:30:33

做一个for循环并相应地输出 html标签？ – Jasonw 2012-07-23 07:22:01

尝试这样的事情

<td><img src="<%=path%>"/"<%=name%>"></td>

想法是给在img标签的文件名与路径一起。请原谅我，如果事情是错误的，因为我不知道JSP

来源

2012-07-23 05:28:45

=路径变量包含路径以及文件名。 – 2012-07-23 05:36:08

nopes你的代码不能正常工作。 – 2012-07-23 05:39:29

“...因为我不知道JSP” - 如何不回答JSP问题>。<？ – Christoph 2012-07-23 07:25:10

首先获得所有出现在这条道路

public class ManipulateImage {  
public static String[] display(){ 

      File folder = new File("C:/Folder Name"); 
      File[] listOfFiles = folder.listFiles(); 
      String [] k = new String[listOfFiles.length]; 
      Arrays.fill(k,"none"); 

       for (int i = 0; i < listOfFiles.length; i++) { 
        if (listOfFiles[i].isFile()) { 
        System.out.println("File " + listOfFiles[i].getName()); 
        k[i]="File " + listOfFiles[i].getName(); 
        } else if (listOfFiles[i].isDirectory()) { 
        System.out.println("Directory " + listOfFiles[i].getName()); 
        } 

       } 
       return k; 
     } 
}

然后在JSP中得到礼物

<% 
    String[] k=ManipulateImage.display(); 
    int l=k.length; 
%>

文件数的文件名

获取显示图像的URL，您无法直接从文件夹中显示图像，因此您需要创建一个Servlet。

for(int i=0;i<k.length;i++){ 
       j[i]=k[i].substring(5); 
       link[i]="http://localhost:8080/ImageUploadWebApp/DisplayImageServlet/images/"+j[i]; 
     } 
URL[] url= new URL[k.length]; 
    for(int i=0;i<k.length;i++){ 
    url[i]= new URL(link[i]); 
    }

显示在网页中的图片

<% 
    for(int i=0; i< k.length ;i++){ 
     out.println(" <img id='copyimg"+i+"' alt='img' style='width:304px;height:228px;' src="+url[i]+">"); 

    } 
%>

servlet代码

public class DisplayImageServlet extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet { 
static final long serialVersionUID = 1L; 
String image_name = ""; 
ResourceBundle props = null; 
String filePath = ""; 
private static final int BUFSIZE = 100; 
private ServletContext servletContext; 
public DisplayImageServlet() { 
super(); 
} 
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
System.out.println("FROM SERVLET"); 
sendImage(getServletContext(), request, response); 
} 
public void sendImage(ServletContext servletContext, 
HttpServletRequest request, HttpServletResponse response) 
throws ServletException, IOException { 
this.servletContext = servletContext; 
String reqUrl = request.getRequestURL().toString(); 
StringTokenizer tokens = new StringTokenizer(reqUrl, "/"); 
int noOfTokens = tokens.countTokens(); 
String tokensString[] = new String[noOfTokens]; 
int count = 0; 
while (tokens.hasMoreElements()) { 
tokensString[count++] = (String) tokens.nextToken(); 
} 
String folderName = tokensString[noOfTokens - 2]; 
image_name = tokensString[noOfTokens - 1]; 
filePath = "/" + folderName + "/" + image_name; 
String fullFilePath = "C:/Folder Name" + filePath; 
System.out.println("FULL PATH :: "+fullFilePath); 
doDownload(fullFilePath, request, response); 
} 
private void doShowImageOnPage(String fullFilePath, 
HttpServletRequest request, HttpServletResponse response) 
throws IOException { 
response.reset(); 
response.setHeader("Content-Disposition", "inline"); 
response.setHeader("Cache-Control", "no-cache"); 
response.setHeader("Expires", "0"); 
response.setContentType("image/tiff"); 
byte[] image = getImage(fullFilePath); 
OutputStream outputStream = response.getOutputStream(); 
outputStream.write(image); 
outputStream.close(); 
} 
private void doDownload(String filePath, HttpServletRequest request, 
HttpServletResponse response) throws IOException { 
File fileName = new File(filePath); 
int length = 0; 
ServletOutputStream outputStream = response.getOutputStream(); 
ServletContext context = servletContext; 
String mimetype = context.getMimeType(filePath); 
response.setContentType((mimetype != null) ? mimetype 
: "application/octet-stream"); 
response.setContentLength((int) fileName.length()); 
response.setHeader("Content-Disposition", "attachment; filename=\"" 
+ image_name + "\""); 
byte[] bbuf = new byte[BUFSIZE]; 
DataInputStream in = new DataInputStream(new FileInputStream(fileName)); 
while ((in != null) && ((length = in.read(bbuf)) != -1)) { 
outputStream.write(bbuf, 0, length); 
} 
in.close(); 
outputStream.flush(); 
outputStream.close(); 
} 
private byte[] getImage(String filename) { 
byte[] result = null; 
String fileLocation = filename; 
File f = new File(fileLocation); 
result = new byte[(int)f.length()]; 
try { 
FileInputStream in = new FileInputStream(fileLocation); 
in.read(result); 
} 
catch(Exception ex) { 
System.out.println("GET IMAGE PROBLEM :: "+ex); 
ex.printStackTrace(); 
} 
return result; 
} 
}

来源

2015-09-11 04:55:22

在jsp中显示图像

回答

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