java后台怎么拿到上传的文件

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追忆小土豆
2017-09-01 · TA获得超过7739个赞
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import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;

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.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class EntityServlet1 extends HttpServlet {

private static final long serialVersionUID = 1L;
private String uploadPath = "D:\\temp"; // 上传文件的目录
File tempPathFile;

// 重写doPost方法,处理事件识别请求
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
try {
// Create a factory for disk-based file items
DiskFileItemFactory factory = new DiskFileItemFactory();

// Set factory constraints
factory.setSizeThreshold(4096); // 设置缓冲区大小,这里是4kb
factory.setRepository(tempPathFile);// 设置缓冲区目录

// Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload(factory);

// Set overall request size constraint
upload.setSizeMax(4194304); // 设置最大文件尺寸,这里是4MB

List<FileItem> items = upload.parseRequest(request);// 得到所有的文件
Iterator<FileItem> i = items.iterator();
while (i.hasNext()) {
FileItem fi = (FileItem) i.next();
String fileName = fi.getName();
if (fileName != null) {
File fullFile = new File(new String(fi.getName().getBytes(), "utf-8")); // 解决文件名乱码问题
File savedFile = new File(uploadPath, fullFile.getName());
fi.write(savedFile);
}
}
System.out.print("upload succeed");
} catch (Exception e) {

}
}
}
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