spring boot项目读取本地（服务器）图片显示在页面

1:在配置文件中加上下面（windows，Linux类似）

我的项目是在F盘，所以这里的虚拟路径是 F:/hd/img/      

web.upload-path=F:/hd/img/                   

spring.mvc.static-path-pattern=/**
spring.resources.static-locations=classpath\:/META-INF/resources/,classpath\:/resources/,classpath\:/static/,classpath\:/public/,file\:${web.upload-path}

classpath:/static/,classpath:/public/,file:${web.upload-path}

2：上传方法，这里是serviceImp层，上传图片的jsp和controller省略了：

@Override
public int insertOrUpdateAdminInfo(AdminInfo admin, MultipartFile file) {
int result=0;
if(file!=null){
String newFileName = file.getOriginalFilename();
String path="/hd/img";
File fileRoot = new File(path);
if (!fileRoot.exists()) {
fileRoot.mkdirs();
}
File targetFile = new File(fileRoot.getAbsolutePath(), newFileName);
try {
file.transferTo(targetFile);
} catch (IOException e) {
return 0;
}
String savePath=path+"/"+newFileName;

admin.setADMIN_IMG(savePath);
result = adminInfoMapper.updateAdminInfo(admin);
  }

return result;
}

3:上传到数据库中图片的路径：/hd/img/Koala.jpg

4:jsp读取页面:

 <img src='${ctx}/getAdminPicture'  style="width:50px"/> 

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5:controller读取方法:

/*
* 获取管理员头像
* @return
* @throws SQLException
*/
@RequestMapping(value = "getAdminPicture")
public void getAdminPicture(HttpServletRequest request, HttpServletResponse response) {
Subject currentUser = SecurityUtils.getSubject();
        Session session = currentUser.getSession();
        AdminInfo admin = (AdminInfo) session.getAttribute("adminInfo");
        try {
        imgUtil.queryPic(admin.getADMIN_IMG(),request,response);
} catch (IOException e) {
e.printStackTrace();
}

}

6:ImgUtil公共类:

package com.hdys.www.util;


import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStream;


import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;


@Component
public class ImgUtil {

/**
* 读数据库，获取图片输入流
* @param id
* @return
* @throws SQLException
*/
public FileInputStream query_getPhotoImageBlob(String adress) {   
  FileInputStream is = null;  
File filePic = new File(adress);
try {
is = new FileInputStream(filePic);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}


return is;

}  
/*
* 获取图片并显示在页面
* @return
* @throws SQLException
*/
@RequestMapping(value = "queryPic")
public void queryPic(@RequestParam(required=false) String adress,HttpServletRequest request, HttpServletResponse response) throws IOException  {  

if (adress != null){  
   response.setContentType("image/jpeg");  
    FileInputStream is =this.query_getPhotoImageBlob(adress);  
    
    if (is != null){   
    int i = is.available(); // 得到文件大小  
   byte data[] = new byte[i];  
   is.read(data); // 读数据  
   is.close();  
   response.setContentType("image/jpeg");  // 设置返回的文件类型  
   OutputStream toClient = response.getOutputStream(); // 得到向客户端输出二进制数据的对象  
   toClient.write(data); // 输出数据  
   toClient.close();  
    }  
   }  
} 
}