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使用JQuery.form插件实现无跳转上传。

以下附上简单实现。

准备：commons-fileupload.jar
commons-io-1.1.jar
jquery-1.3.1.js
jquery.form.js

表单提交脚本：

$(document).ready(function() {
var options = {
target:        '#output2',
beforeSubmit:  showRequest,
success:       showResponse
};
$('#form1').submit(function() {
$(this).ajaxSubmit(options);
return false;//阻止表单提交
});
function showRequest(formData, jqForm, options) {
var queryString = $.param(formData);
alert('queryString==' + queryString);
return true;
}
function showResponse(responseText, statusText) {
alert('status: ' + statusText + '\n\nresponseText:'+responseText);
}
});

html表单：

<form action="MyJsp.jsp" method="post" name="form1" id="form1" enctype="multipart/form-data">
<input type="file" id="file1" name="file1"/><br/>
<input type="text" id="username" name="username" value=""/>
<input type="submit" name="submitButton" value="update">
<div id="output2"></div>
</form>

java处理代码：

DiskFileItemFactory factory = new DiskFileItemFactory();
String filePath = application.getRealPath("/upload");
factory.setRepository(new File(filePath));
factory.setSizeThreshold(1024*1024);
//创建新的文件上传处理类
ServletFileUpload upload = new ServletFileUpload(factory);

try {
List list = upload.parseRequest(request);   //处理请求
for(FileItem item : list){
if(item.isFormField()){//表单元素
//String name=item.getFieldName();
//System.out.println("value==>"+item.getString());
}
else {
String name=item.getFieldName();
String value=item.getName();
int start=value.lastIndexOf("\\");
String fileName=value.substring(start+1);
System.out.println("fileName=>"+fileName);
item.write(new File(filePath,fileName));
}
}
response.setContentType("text/html");
response.setCharacterEncoding("GBK");
response.setHeader("cache-control","no-cache");
PrintWriter out = response.getWriter();
out.print("OK");
out.flush();
out.close();
} catch (FileUploadException e) {
e.printStackTrace();
}