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="https://www.jb51.net/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> <table> <tr> <td>sCompany:</td> <td><input type="text" value="tom" /></td> </tr> <tr> <td>scardtype:</td> <td><input type="text" value="23" /></td> </tr> <tr> <td>file:</td> <td><input type="file" /></td> </tr> </table> <input type="button" 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; } }