JAVA怎么把图片从数据库中调用出来

1 一半图片都是把路径存放在数据库的 到时候取出路径就可以了

2 在数据库有blob格式可以存放图片 以二进制流的方式取出来

<% String zjbm = CheckParam(request.getParameter("zjbm"),"") String zpSql = "select zp from tjjryxxx where sfzh = '"+zjbm+"'" out.clear() response.setContentType("image/jpeg") response.setHeader("Content-Transfer-Encoding","base64") Connection connection = null PreparedStatement ps = null ResultSet rs = null Blob blob =null byte[] data = null try{ connection =getConn() ps = connection.prepareStatement(zpSql) rs = ps.executeQuery() while(rs.next()){blob = (Blob)rs.getBlob("zp") long nlen = blob.length() int nsize = (int) nlen data = blob.getBytes(1,nsize) OutputStream out1 = response.getOutputStream() BufferedOutputStream bos =null bos = new BufferedOutputStream(out1) bos.write(data,0,data.length) bos.close() rs.close() } }catch(Exception e){ e.printStackTrace()} %>

如果你想通过名称获取某个值，且名称和值之间是映射关系，你应该使用Map这一数据结构。

Map<String, Integer>map = new HashMap<>()

map.put("a", 0)

map.put("b", 2)

map.put("c", 10)

System.out.println(map.get("b"))

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