Question

jsp文件上传

public class MultipartTestServlet extends HttpServlet {

public MultipartTestServlet() {

super();

}

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

request.setCharacterEncoding("gbk");

RequestContext requestContext = new ServletRequestContext(request);

if(FileUpload.isMultipartContent(requestContext)){

DiskFileItemFactory factory = new DiskFileItemFactory();

factory.setRepository(new File("c:/tmp/"));

ServletFileUpload upload = new ServletFileUpload(factory);

//upload.setHeaderEncoding("gbk");

upload.setSizeMax(2000000);

List items = new ArrayList();

try {

items = upload.parseRequest(request);

} catch (FileUploadException e1) {

System.out.println("文件上传发生错误" + e1.getMessage());

}

Iterator it = items.iterator();

while(it.hasNext()){

FileItem fileItem = (FileItem) it.next();

if(fileItem.isFormField()){

System.out.println(fileItem.getFieldName() + " " + fileItem.getName() + " " + new String(fileItem.getString().getBytes("iso8859-1"), "gbk"));

}else{

System.out.println(fileItem.getFieldName() + " " +

fileItem.getName() + " " +

fileItem.isInMemory() + " " +

fileItem.getContentType() + " " +

fileItem.getSize());

if(fileItem.getName()!=null && fileItem.getSize()!=0){

File fullFile = new File(fileItem.getName());

File newFile = new File("c:/temp/" + fullFile.getName());

try {

fileItem.write(newFile);

} catch (Exception e) {

e.printStackTrace();

}

}else{

System.out.println("文件没有选择 或 文件内容为空");

}

}

}

}

}

}

能给我解释一下每个方法的含义吗，我找javadoc了，可是都是英文的，看不太明白，谢谢。

Answer 1

public class MultipartTestServlet extends HttpServlet {

public MultipartTestServlet() { //构造方法

super();

}

public void doPost(HttpServletRequest request, HttpServletResponse response) //servlet的doPost方法处理POST请求

throws ServletException, IOException { //抛出异常

request.setCharacterEncoding("gbk"); //设置字符为GBK

RequestContext requestContext = new ServletRequestContext(request); //实例化RequestContext对象

if(FileUpload.isMultipartContent(requestContext)){
//判断是否包含 multipart 内容

DiskFileItemFactory factory = new DiskFileItemFactory();
// 创建基于磁盘的文件工厂
factory.setRepository(new File("c:/tmp/")); // 设置临时目录

ServletFileUpload upload = new ServletFileUpload(factory);

upload.setHeaderEncoding("gbk");

upload.setSizeMax(2000000); //设置缓冲区大小

List items = new ArrayList();

try {

items = upload.parseRequest(request); // 得到所有的文件

} catch (FileUploadException e1) {

System.out.println("文件上传发生错误" + e1.getMessage());

}

Iterator it = items.iterator();

while(it.hasNext()){

FileItem fileItem = (FileItem) it.next();

if(fileItem.isFormField()){

System.out.println(fileItem.getFieldName() + " " + fileItem.getName() + " " + new String(fileItem.getString().getBytes("iso8859-1"), "gbk")); //获得表单中域的名字。获得从浏览器中取得的文件全路径

}else{

System.out.println(fileItem.getFieldName() + " " +

fileItem.getName() + " " +

fileItem.isInMemory() + " " +

fileItem.getContentType() + " " +

fileItem.getSize());

if(fileItem.getName()!=null && fileItem.getSize()!=0){
// 浏览器中取得的文件全路径不为空 大小 不为0 则写入

File fullFile = new File(fileItem.getName());

File newFile = new File("c:/temp/" + fullFile.getName());

try {

fileItem.write(newFile);

} catch (Exception e) {

e.printStackTrace();

}

}else{

System.out.println("文件没有选择 或 文件内容为空");

}

}

}

}

}

}