java实现文件上传功能(返回服务器文件路径)

野性酷女 2021-12-05 15:23 1287阅读 0赞

### 有时候我们会有一些需求需要上传一些图片或者一些文件,我们写一个小例子来实现这个功能. ###

### 我这次是针对上传图片来做的,其实就是后缀名限制,返回自己定义 ###

import java.io.File;
    import java.io.IOException;
    import java.text.SimpleDateFormat;
    import java.util.Date;
    import java.util.HashMap;
    import java.util.Map;
    import java.util.Random;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestParam;
    import org.springframework.web.bind.annotation.ResponseBody;
    import org.springframework.web.bind.annotation.RestController;
    import org.springframework.web.multipart.MultipartFile;
    
    @RestController
    @RequestMapping("/company/public")
    public class PublicController {
    
        /**
         * 上传用户反馈图片
         * @param file
         * @param request
         * @param response
         * @author sunran
         * @return
         */
        @ResponseBody
        @RequestMapping("/upload")
        public Object uploadPicture(@RequestParam(value="file",required=false)MultipartFile file,HttpServletRequest request,HttpServletResponse response){
        	ResultResp result = new ResultResp();
        	int maxSize = 1024*1024*1;    //上传最大为1MB
        	if (file.getSize()>maxSize) {
        		result.setMsg("最大上传限制1Mb");
                return result;
    		}
    		Map<String, Object> map = new HashMap<String, Object>();
            File targetFile=null;
            String url="";//返回存储路径
            String fileName=file.getOriginalFilename();//获取文件名加后缀
            if(fileName!=null&&fileName!=""){
                String path = "/data/file/";
                //String path = "D:/data/file/";
                String fileF = fileName.substring(fileName.lastIndexOf("."), fileName.length());//文件后缀
                if (!(fileF.equals(".jpg") || fileF.equals(".jpeg") || fileF.equals(".png") || fileF.equals(".image"))) {
                    result.setMsg("只能上传jpg,jpeg,png,image格式");
                    return result;
    			}
                //新的文件名
                fileName=new Date().getTime()+"_"+new Random().nextInt(1000)+fileF;
                //获取文件夹路径
                File file1=new File(path); 
                //如果文件夹不存在则创建    
                if(!file1.exists()  && !file1.isDirectory()){       
                    file1.mkdirs();  
                }
                //将图片存入文件夹
                targetFile = new File(file1, fileName);
                try {
                	//将上传的文件写到服务器上指定的文件。
                	file.transferTo(targetFile);
    				//赋予权限
                    String command = "chmod 775 -R " + targetFile;
            		Runtime runtime = Runtime.getRuntime();
            		Process proc = runtime.exec(command);
                    //生成文件地址
                    url="http://XXXXXXXXX.cn"+path+"/"+fileName;
                    result.setCode(200+"");
                    result.setMsg("图片上传成功");
                    System.out.println("图片上传成功 url:"+url);
                    map.put("url", url);
                    result.setData(map);
                } catch (Exception e) {
                    e.printStackTrace();
                    result.setMsg("系统异常，图片上传失败");
                }
            }
            return result;
        }
    }

### 我们可以本地测试一下,把路径改成我们电脑本地就行了 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2NzI1Mjgy_size_16_color_FFFFFF_t_70]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2NzI1Mjgy_size_16_color_FFFFFF_t_70 1]

## 测试一下 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2NzI1Mjgy_size_16_color_FFFFFF_t_70 2]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2NzI1Mjgy_size_16_color_FFFFFF_t_70 3]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2NzI1Mjgy_size_16_color_FFFFFF_t_70 4]

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