核心代码
核心代码由于HttpServletRequest不能直接取出文件数据，所以将其强制转换为MultipartHttpServletRequest

MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
List files = multipartRequest.getFiles("files");
MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
List files = multipartRequest.getFiles("files");POST
POST
/*提交表单*/
function myupload() {

$.ajax({

url:"/exUploadController.do?uploadTest",

type : "POST",

async: false,

cache: false, //此处设置false

contentType: false,//必须设置false ,formupload1表单中必须设置enctype="multipart/form-data"

processData: false, //必须设置fals

data :new FormData(document.getElementById("myForm")),

success:function (data) {

alert(data);

},

error:function (XMLHttpRequest, textStatus, errorThrown) {

console.log(XMLHttpRequest);

console.log(textStatus);

console.log(errorThrown);

}

})
}

/*提交表单*/
function myupload() {

$.ajax({

url:"/exUploadController.do?uploadTest",

type : "POST",

async: false,

cache: false, //此处设置false

contentType: false,//必须设置false ,formupload1表单中必须设置enctype="multipart/form-data"

processData: false, //必须设置fals

data :new FormData(document.getElementById("myForm")),

success:function (data) {

alert(data);

},

error:function (XMLHttpRequest, textStatus, errorThrown) {

console.log(XMLHttpRequest);

console.log(textStatus);

console.log(errorThrown);

}

})
}
ServletServlet

HttpServletRequest request;

//获取上传图片

MultipartHttpServletRequest mureq = (MultipartHttpServletRequest) request;

Map files = mureq.getFileMap();

MultipartFile file =null;

if (files != null &&files.size()> 0) {



Map.Entry f = files.entrySet().iterator().next();

file = f.getValue();

}


//获取项目部署的路径


String rootPath = request.getSession().getServletContext().getRealPath("/");


//获取上传图片的名称

String fileName = file.getOriginalFilename();





//获取上传图片的大小

float size = file.getSize()


//在path路径下创建一个文件


File newFile = new File(path);


//判断文件是否存在

if(!newFile.exists()) {

newFile.mkdirs();//不存在的话，就开辟一个空间

}

//将上传的文件存储

file.transferTo(newFile);


HttpServletRequest request;

//获取上传图片

MultipartHttpServletRequest mureq = (MultipartHttpServletRequest) request;

Map files = mureq.getFileMap();

MultipartFile file =null;

if (files != null &&files.size()> 0) {



Map.Entry f = files.entrySet().iterator().next();

file = f.getValue();

}


//获取项目部署的路径


String rootPath = request.getSession().getServletContext().getRealPath("/");


//获取上传图片的名称

String fileName = file.getOriginalFilename();





//获取上传图片的大小

float size = file.getSize()


//在path路径下创建一个文件


File newFile = new File(path);


//判断文件是否存在

if(!newFile.exists()) {

newFile.mkdirs();//不存在的话，就开辟一个空间

}

//将上传的文件存储

file.transferTo(newFile);
以上就是本文的全部内容，希望对大家的学习有所帮助。