JAVA读取MongoDB中的二进制图片并显示在页面上

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1：Jsp页面：

<td><img src="${ctx}/mongoImg/show"></td>

2：xml配置：

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"xmlns:mongo="http://www.springframework.org/schema/data/mongo"xsi:schemaLocation="http://www.springframework.org/schema/beans          http://www.springframework.org/schema/beans/spring-beans-3.0.xsd          http://www.springframework.org/schema/data/mongo               http://www.springframework.org/schema/data/mongo/spring-mongo-1.0.xsd           http://www.springframework.org/schema/context          http://www.springframework.org/schema/context/spring-context-3.0.xsd"><mongo:mongo host="${resource.db.host}" port="${resource.db.port}" /><mongo:db-factory id="mongoDbFactory" dbname="gate" mongo-ref="mongo" /><bean class="org.springframework.data.mongodb.gridfs.GridFsTemplate"><constructor-arg ref="mongoDbFactory" /><constructor-arg ref="converter" /></bean><mongo:mapping-converter id="converter"/></beans>

3：java后台代码

package com.crscic.igms.manager.web;import java.io.OutputStream;import java.util.List;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.data.mongodb.gridfs.GridFsTemplate;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import com.mongodb.gridfs.GridFSDBFile;@Controller@RequestMapping(value = "/mongoImg")public class MongoImgController {@AutowiredGridFsTemplate gridFsTemplate;@RequestMapping(value = "/show")public void show(HttpServletRequest req, HttpServletResponse resp){try {OutputStream out = resp.getOutputStream();resp.setContentType("image/png");List<GridFSDBFile> find = gridFsTemplate.find(null);GridFSDBFile gridFSDBFile = find.get(0);gridFSDBFile.writeTo(out);out.flush();out.close();} catch (Exception e) {e.printStackTrace();}}}

在JAVA代码中，因为只是个例子而已，所以我使用的是gridFsTemplate.find(null);查询的全部图片，而且数据库中只有2条数据，我这里就把第一条数据查出来作为例子了。各位可以根据自己的业务需要，在页面传递参数进来，并且查询特定的数据。

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