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<script type="text/javascript">
function Upload() {
$("#loading").ajaxStart(function() {
$(this).show();
}).ajaxComplete(function() {
$(this).hide();
});
$.ajaxFileUpload({
type: 'get',
// servlet请求路径
url : 'upload',
secureuri : false,
fileElementId : 'fileToUpload',// 上传控件的id
dataType : 'json',
data : {username : $("#username").val()}, // 其它请求参数
success : function(data, status) {
if(data.msg) {
alert(data.msg);
}
},
error : function(data, status, e) {
alert('上传出错');
}
});
return false;
}
</script>
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>uploadProcessorServlet</servlet-name>
<servlet-class>upload.UploadProcessorServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>uploadProcessorServlet</servlet-name>
<url-pattern>/upload</url-pattern>
</servlet-mapping>
package upload;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
public class UploadProcessorServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private static String PATH_FOLDER = "/";
private static String TEMP_FOLDER = "/";
/**
* Constructor of the object.
*/
public UploadProcessorServlet() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
System.out.println("正常进入");
request.setCharacterEncoding("utf-8"); // 设置编码
response.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=UTF-8");
// 获得磁盘文件条目工厂
DiskFileItemFactory factory = new DiskFileItemFactory();
// 如果没以下两行设置的话,上传大的文件会占用很多内存,
// 设置暂时存放的存储室 ,这个存储室,可以和最终存储文件的目录不同
/**
* 原理 它是先存到 暂时存储室,然后在真正写到 对应目录的硬盘上, 按理来说 当上传一个文件时,其实是上传了两份,第一个是以 .tmp
* 格式的 然后再将其真正写到 对应目录的硬盘上
*/
factory.setRepository(new File(TEMP_FOLDER));
// 设置 缓存的大小,当上传文件的容量超过该缓存时,直接放到 暂时存储室
factory.setSizeThreshold(1024 * 1024);
// 高水平的API文件上传处理
ServletFileUpload upload = new ServletFileUpload(factory);
try {
// 提交上来的信息都在这个list里面
// 这意味着可以上传多个文件
// 请自行组织代码
List<FileItem> list = upload.parseRequest(request);
// 获取上传的文件
FileItem item = getUploadFileItem(list);
// 获取文件名
String filename = getUploadFileName(item);
System.out.println("存放目录:" + PATH_FOLDER);
System.out.println("文件名:" + filename);
// 真正写到磁盘上
item.write(new File(PATH_FOLDER, filename)); // 第三方提供的
// 输出信息,前端页面获取,这里用的json格式
PrintWriter writer = response.getWriter();
writer.print("{");
writer.print("msg:\"文件大小:"+item.getSize()+",文件名:"+filename+"\"");
writer.print("}");
writer.close();
} catch (FileUploadException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
private FileItem getUploadFileItem(List<FileItem> list) {
for (FileItem fileItem : list) {
if(!fileItem.isFormField()) {
return fileItem;
}
}
return null;
}
private String getUploadFileName(FileItem item) {
String value = item.getName();
int start = value.lastIndexOf("\\");
String filename = value.substring(start + 1);
return filename;
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init(ServletConfig config) throws ServletException {
// Put your code here
System.out.println("正常进入");
ServletContext servletCtx = config.getServletContext();
// 初始化路径
// 保存文件的目录
PATH_FOLDER = servletCtx.getRealPath("/upload");
// 存放临时文件的目录,存放xxx.tmp文件的目录
TEMP_FOLDER = servletCtx.getRealPath("/uploadTemp");
}
}