使用ajax跨域调用springboot框架的api传输文件

在新项目中使用的是springboot编写的api，涉及到ajax跨域请求和传输文件的问题，在这里记录一下
首先是前台页面的代码

<!DOCTYPE html>
<html>
<head>
<meta charset=\”utf-8\”>
<title>test_api</title>
<script type=\”text/javascript\” src=\”jquery-1.7.2.js\”></script>
<script type=\”text/javascript\”>
function test(){
var obj = new Object;
obj.name = $(\”#name\”).val();
obj.age = $(\”#age\”).val();
var file = document.getElementById(\”file\”).files[0];
var formData = new FormData();
formData.append(\”data\”,JSON.stringify(obj));
formData.append(\”file\”,file);
$.ajax({
type:\”post\”,
url:\”http://localhost:8187/test/upload\”,
contentType:false,
processData:false,
data:formData,
success:function(data){
alert(data.msg);
}
});
}
</script>
</head>
<body>
<div class=\”\”>
<table>
<tr>
<td>sCompany:</td>
<td><input type=\”text\” id=\”name\” value=\”tom\” /></td>
</tr>
<tr>
<td>scardtype:</td>
<td><input type=\”text\” id=\”age\” value=\”23\” /></td>
</tr>
<tr>
<td>file:</td>
<td><input type=\”file\” id=\”file\” /></td>
</tr>
</table>
<input type=\”button\” onclick=\”test();\” value=\”提交\” />
</div>
</body>
</html>

程序入口类的代码

package test;

import javax.servlet.MultipartConfigElement;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.MultipartConfigFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

/**
* Hello world!
*
*/

@SpringBootApplication
public class App
{

public static void main( String[] args )
{
SpringApplication.run(App.class, args);
}
//设置ajax跨域请求
@Bean
public WebMvcConfigurer corsConfigurer(){
return new WebMvcConfigurerAdapter(){

@Override
public void addCorsMappings(CorsRegistry registry) {
registry.addMapping(\”/**\”).allowedOrigins(\”*\”);
}
};
}

@Bean
public MultipartConfigElement multipartConfigElement(){
MultipartConfigFactory factory = new MultipartConfigFactory();
//设置上传文件大小限制
factory.setMaxFileSize(\”10MB\”);
//设置上传总数据大小
factory.setMaxRequestSize(\”15MB\”);
return factory.createMultipartConfig();
}
}

api代码

package test.controller;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import test.model.UploadInfo;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;

@RestController
@RequestMapping(\”/test\”)
public class TestController {

/**
* 上传文件
* @param req form请求
* @return json字符串
*/
@RequestMapping(value=\”/upload\”, method=RequestMethod.POST)
public String uploadFile(HttpServletRequest req){
// 返回结果用 json对象
JSONObject returnObj = new JSONObject();
//从请求中获取请求的json字符串
String strData = req.getParameter(\”data\”);
//将获取到的JSON字符串转换为Imgidx对象
UploadInfo info = JSON.parseObject(strData, UploadInfo.class);
//获取上传的文件集合
List<MultipartFile> files = ((MultipartHttpServletRequest)req).getFiles(\”file\”);
MultipartFile file = files.get(0);
// 返回信息头部
Map<String, String> header = new HashMap<String, String>();
header.put(\”code\”, \”0\”);
header.put(\”msg\”, \”success\”);
File file1234 = new File(file.getOriginalFilename());
//插入数据的影响的数据条数
int result = 0;
//将文件上传到save
if(!file.isEmpty()){
try{
byte[] arr = new byte[1024];
BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file1234));
bos.write(arr);
bos.flush();
bos.close();
}catch(Exception e){
header.put(\”code\”, \”-1\”);
header.put(\”msg\”, \”errorMsg:\” + e.getMessage());
}
}else{
header.put(\”code\”, \”-1\”);
header.put(\”msg\”, \”errorMsg:上传文件失败，因为文件是空的\”);
}
String returnStr = returnObj.toJSONString(header);
return returnStr;
}
}