java 上传图片与图片读取

上传：

//获取参数文件流,并将文件流转化成二进制数组，适应JSP与Servlet

DiskFileItemFactory factory = new DiskFileItemFactory();

ServletFileUpload sfu = new ServletFileUpload(factory); sfu.setFileSizeMax(102400000);

sfu.setSizeMax(204800000);

List items = null;

try {

items = sfu.parseRequest(request);

} catch (SizeLimitExceededException e) {

System.out.println("size limit exception!");

} catch(Exception e) {

e.printStackTrace();

}

Iterator iter = items==null?null:items.iterator();

while(iter != null && iter.hasNext()) {

FileItem item = (FileItem)iter.next();

if(item.isFormField()) {

System.out.print("form field:");

System.out.print(item.getFieldName() + " ");

System.out.print(item.getString());

}else if(!item.isFormField()) {

System.out.println("client name:" + item.getName());

String fileName = item.getName();

//item.getInputStream() 获得文件流方法，其他文件不需要转化成二进制数组则不需要下面的转换

BufferedInputStream in = new BufferedInputStream(item.getInputStream());

byte[] b = new byte[in.available()];

in.read(b);

}

下载：

读取java类：

import java.io.InputStream;
import java.math.BigDecimal;
import java.sql.Blob;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;import javax.sql.DataSource;import org.springframework.jdbc.datasource.DataSourceUtils;import com.baosight.efmpx.system.sql.SqlID;
import com.baosight.efmpx.system.util.BeanContext;
import com.baosight.efmpx.system.util.ExceptionUtil;
import com.baosight.iplat4j.core.exception.PlatException;
import com.baosight.iplat4j.dao.ibatis.sqlmap.engine.impl.SqlMapClientImpl;
import com.ibatis.sqlmap.engine.mapping.parameter.ParameterMap;
import com.ibatis.sqlmap.engine.mapping.sql.Sql;
import com.ibatis.sqlmap.engine.mapping.sql.dynamic.DynamicSql;
import com.ibatis.sqlmap.engine.mapping.statement.MappedStatement;
import com.ibatis.sqlmap.engine.scope.RequestScope;/*** @author danger*读取人员照片Dao*/
public class EmpPhotoDao {//读取人员照片blob字段public static List<Map> readPhoto(Object param){DataSource ds = null;Connection con = null;PreparedStatement ps = null;ResultSet resultSet = null;InputStream inputStream = null;List<Map> result = new ArrayList<Map>();try {SqlID sqlid = new SqlID("HREGEmpPhoto","readPhoto");SqlMapClientImpl client = BeanContext.getSqlMapClientImpl();/*取得查询语句*/MappedStatement statement = client.getMappedStatement(sqlid.getSqlID());/*取得ibatis sql对象*/Sql sql = statement.getSql();/*取得ibatis 参数map对象*/ ParameterMap parameterMap = null;RequestScope requestScope = new RequestScope();requestScope.setStatement(statement);if (sql instanceof DynamicSql/*动态sql*/) {parameterMap = sql.getParameterMap(requestScope, param);}else{parameterMap = statement.getParameterMap();}/*取得带参数的sql语句*/String s = sql.getSql(requestScope, param);//取得SQL连接对象ds = (DataSource)BeanContext.getBean("dataSource");con = ds.getConnection();ps = con.prepareStatement(s);if (parameterMap != null){     if(param instanceof Map){           parameterMap.setParameters(requestScope, ps, parameterMap.getParameterObjectValues(requestScope, param));}else{if(s.indexOf("?")>0){ps.setString(1, (String)param);}}}/*执行查询*/resultSet = ps.executeQuery();/*转换成目标对象*/Class c = statement.getResultMap().getResultClass();ResultSetMetaData rsm = resultSet.getMetaData();int columnCount = rsm.getColumnCount();while (resultSet.next()) {Map objMap = new HashMap();for (int i = 0; i < columnCount; i++) {if (resultSet.getObject(i + 1) instanceof Blob) {Blob blob = resultSet.getBlob(i + 1);Long length = blob.length();inputStream = blob.getBinaryStream();if(inputStream != null){byte [] bytes = new byte[length.intValue()];inputStream.read(bytes);objMap.put(rsm.getColumnName(i + 1), bytes);}inputStream.close();} else {  objMap.put(rsm.getColumnName(i + 1), resultSet.getObject(i + 1));}}result.add(objMap);}} catch (SQLException e) {e.printStackTrace();throw new PlatException(ExceptionUtil.getDB2CNMessage(e));}catch (Exception e) {e.printStackTrace();} finally {try {if(ps!=null)ps.close();if(resultSet!=null)resultSet.close();DataSourceUtils.doReleaseConnection(con, ds);} catch (SQLException e1) {// TODO Auto-generated catch blocke1.printStackTrace();throw new PlatException(ExceptionUtil.getDB2CNMessage(e1));}return result;} }}

JSP将Blob 二进制数组转成图片

<%@page import="javax.servlet.jsp.tagext.TryCatchFinally"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%>
<%@ page import="*.EmpPhotoDao" %>
<%@ page import="java.util.Map" %>
<%@ page import="java.util.HashMap" %>
<%@ page import="java.io.OutputStream" %>
<%@ page import="java.util.List" %>
<%OutputStream output = null;try{String empId = request.getParameter("empId");if(empId == null || empId.equals("")){return;}Map param = new HashMap();param.put("empId",empId);//调用java类方法获取结果集List<Map> result = EmpPhotoDao.readPhoto(param);if(result != null && result.size() > 0){for(Map map:result){byte[] bytes = (byte[])map.get("photo");if(bytes != null){String sbytes = new String(bytes);//设置HTML响应内容类型为图片if(sbytes.equalsIgnoreCase("GIF")){response.setContentType("image/gif");}else{response.setContentType("image/jpeg");}//输出图片output = response.getOutputStream();output.write(bytes,0,bytes.length);output.flush();}else{return;}}}}catch(Exception e) {e.printStackTrace();}finally{try{if(output !=null){//关闭流output.close();out.clear();out = pageContext.pushBody();}}catch (Exception e) {e.printStackTrace();}   }
%>

jsp显示图片代码：<!-- src为上面jsp的路径-->

<img src="EFMPX/HR/EG/imageDownload.jsp?empId=${emp.empId}" width="107" height="155" />

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