标签：java spring mvc upload.parserequestr common-fileupload
首先我们来看下Spring mvc 中文件上传的配置
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <property name="defaultEncoding" value="UTF-8" /> <property name="maxUploadSize" value="2000000000" /> </bean>
public void upload2(HttpServletRequest request) {
// 转型为MultipartHttpRequest
try {
MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
List<MultipartFile> fileList = multipartRequest.getFiles("file");
for (MultipartFile mf : fileList) {
if(!mf.isEmpty()){
}
}
} catch (Exception e) {
e.printStackTrace();
}
}方式二public String upload(HttpServletRequest request,
@RequestParam(value = "file") MultipartFile[] files) {
try {
for (MultipartFile mf : files) {
if(!mf.isEmpty()){
}
}
} catch (Exception e) {
e.printStackTrace();
}
return "upload";
}
他的转换器里面就是调用common-fileupload的方式解析,然后再使用parseFileItems()方法封装成自己的文件对象 .
List<FileItem> fileItems = ((ServletFileUpload) fileUpload).parseRequest(request);
1)删除Spring MVC文件上传配置
<!-- <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <property name="defaultEncoding" value="UTF-8" /> <property name="maxUploadSize" value="2000000000" /> </bean> -->在控制器里面自己完成request的解析(当然上面spring MVC提供的两种方法是不能用的,所有上传的地方都需要自己做处理)
public void upload3(HttpServletRequest request) {
DiskFileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(factory);
try {
List<FileItem> list = upload.parseRequest(request);
for(FileItem item : list){
if(item.isFormField()){
}else{
//item.write(new File(""));
}
}
} catch (FileUploadException e) {
e.printStackTrace();
}
}2)如果是需要使用的ProgressListener监听器我们可以重写 CommonsMultipartResolver的parseRequest方法
package com.lwp.spring.ext;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUpload;
import org.apache.commons.fileupload.FileUploadBase;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.springframework.web.multipart.MaxUploadSizeExceededException;
import org.springframework.web.multipart.MultipartException;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;
import com.lwp.listener.FileUploadListener;
public class CommonsMultipartResolverExt extends CommonsMultipartResolver {
@Override
protected MultipartParsingResult parseRequest(HttpServletRequest request)
throws MultipartException {
FileUploadListener listener = new FileUploadListener();
String encoding = determineEncoding(request);
FileUpload fileUpload = prepareFileUpload(encoding);
fileUpload.setProgressListener(listener);
try {
List<FileItem> fileItems = ((ServletFileUpload) fileUpload).parseRequest(request);
return parseFileItems(fileItems, encoding);
}
catch (FileUploadBase.SizeLimitExceededException ex) {
throw new MaxUploadSizeExceededException(fileUpload.getSizeMax(), ex);
}
catch (FileUploadException ex) {
throw new MultipartException("Could not parse multipart servlet request", ex);
}
}
}
监听器方法
import org.apache.commons.fileupload.ProgressListener;
public class FileUploadListener implements ProgressListener {
@Override
public void update(long arg0, long arg1, int arg2) {
//arg0 已经上传多少字节
//arg1 一共多少字节
//arg2 正在上传第几个文件
System.out.println(arg0 +"\t" + arg1 +"\t" + arg2);
}
}
配置文件改为我们自己的(这种方式的缺陷是,所有文件上传都需要使用到Listener)
<bean id="multipartResolver" class="com.lwp.spring.ext.CommonsMultipartResolverExt"> <property name="defaultEncoding" value="UTF-8" /> <property name="maxUploadSize" value="2000000000" /> </bean>
SpringMVC中servletFileUpload.parseRequest(request)解析为空获取不到数据问题
标签：java spring mvc upload.parserequestr common-fileupload
原文地址：http://blog.csdn.net/lwphk/article/details/43015829
