1. base64(字符串)作为数据源（在前端生成的文件而非选择的文件）。
前端调用上传接口示例
// 图片分组上传，images，subjectTypeImages 为图片转的base64数组，titles是字符串数组。
var formData = new FormData();
images.forEach(function (image) {
formData.append("picture[]", image);
});
subjectTypeImages.forEach(function (image) {
formData.append("subjectTypeImages[]", image);
});
subjectStatusImages.forEach(function (image) {
formData.append("subjectStatusImages[]", image);
});
titles.forEach(function (image) {
formData.append("titles[]", image);
});
// 而外的参数数据
formData.append("titleKey", titleKey);
formData.append("searchType", searchType);
$.ajax({
url:'upload.do',
method:'POST',
data:formData,
// 默认为true，设为false后直到ajax请求结束(调完回掉函数)后才会执行$.ajax(...)后面的代码
async: false,
// 下面三个，因为直接使用FormData作为数据，contentType会自动设置，也不需要jquery做进一步的数据处理(序列化)。
cache: false,
contentType: false,
processData: false,
success:function(data){
console.log(data);
},
error:function(error){
console.log(error.message);
}
});
java(springMVC) 后端接收示例
@ResponseBody
@RequestMapping(value = "upload.do", method = RequestMethod.POST)
public Object upload(HttpServletRequest request) throws Exception {
CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext());
// 先判断request中是否包涵multipart类型的数据，
if (multipartResolver.isMultipart(request)) {
MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;
String[] picture = multiRequest.getParameterValues("picture[]");
String[] subjectTypeImages = multiRequest.getParameterValues("subjectTypeImages[]");
String[] subjectStatusImages = multiRequest.getParameterValues("subjectStatusImages[]");
String[] titles = multiRequest.getParameterValues("titles[]");
String searchType = multiRequest.getParameter("searchType");
String titleKey = multiRequest.getParameter("titleKey");
// todo: any-thing
}
return "success";
}
2. form 表单中使用input 选择文件上传， File类型
form 表单
<form id="form111" enctype="multipart/form-data" method="post" action="#">
<input type="file" name="files">
<input type="file" name="files">
<input type="file" name="files">
<!-- 这个可以选择多个文件，而且只可以选图片 -->
<input type="file" name="files" accept="image/*" multiple>
<input type="text" name="username">
<input type="button" id="btn">
</form>
javascript 上传接口调用示例
$("#btn").click(function () {
// 获取所有文件
// 1. 使用直接使用form表单获取，会获取所有input值
var fomdata = new FormData(document.getElementById("form111"));
// 2. 只获取文件
var fomdata = new FormData();
$("#form111").children("input[name='files']").each(function (index, input) {
for(var i=0; i<input.files.length; i++) {
fomdata.append("files", input.files[i]);
}
});
$.ajax({
method:'POST',
data:formData,
url:'upload.do',
// async: false, // 同步上传，默认(true)异步
cache: false,
contentType: false,
processData: false,
success:function(data){
console.log(data);
},
error:function(){
console.log('上传失败');
}
});
});
java(springMVC) 后端代码示例
@ResponseBody
@RequestMapping(value = "upload.do", method = RequestMethod.POST)
public Object upload(MultipartFile[] files/* files 为input的name，这样就可以获取所有文件的数组了。*/, String filename, HttpServletRequest request) throws Exception {
// 遍历数组保存文件，并把文件相对路径存到数据库。。。等。
return "success";
}
推荐一个前端上传组件
java 后端代码示例
@ResponseBody
@RequestMapping(value = "upload.do", method = RequestMethod.POST)
public Object uploadFile(MultipartFile file, String name1, HttpServletRequest request) throws Exception {
UploadDto uploadDto = new UploadDto(); // 就是一个格式化返回信息的类。
CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext());
// 先判断request中是否包涵multipart类型的数据，
if (multipartResolver.isMultipart(request)) {
try {
//
String fileId = service.saveFile(file);
uploadDto.setMessage("上传成功!");
uploadDto.setCode(0);
uploadDto.setFileId(fileId);
} catch (Exception e) {
e.printStackTrace();
uploadDto.setMessage("上传失败!");
uploadDto.setCode(-1);
}
}
return uploadDto;
}
