Java 使用jersey在浏览器中显示Blob
我一直得到image==null！从服务器。我只是想把我上传到mysql的图像显示为fileinputstream中的一个blob。在数据库中，它显示为bufferedinputstream供参考。我把它硬编码，看能不能得到结果。你们能看到我做错了什么吗Java 使用jersey在浏览器中显示Blob,java,web-services,rest,jersey,blob,Java,Web Services,Rest,Jersey,Blob,我一直得到image==null！从服务器。我只是想把我上传到mysql的图像显示为fileinputstream中的一个blob。在数据库中，它显示为bufferedinputstream供参考。我把它硬编码，看能不能得到结果。你们能看到我做错了什么吗 @Path("/photo" ) public class DisplayPhoto { @GET @Path("{id}") @Produces("image/*") public Response post(@PathParam("i
@Path("/photo" )
public class DisplayPhoto {
@GET
@Path("{id}")
@Produces("image/*")
public Response post(@PathParam("id") String id) {
Connection con = connection();
BufferedImage image = null;
try {
image = ImageIO.read( getPhoto(con).getBinaryStream() );
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
ByteArrayOutputStream baos2 = new ByteArrayOutputStream();
try {
ImageIO.write( image, "jpg", baos2 );
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return Response.ok(baos2.toByteArray()).build();
}
public Connection connection(){
Connection con = null;
try {// set up driver for database
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
try {
con = DriverManager.getConnection("jdbc:mysql://aa1c9da17owdhky.cotr7twg0ekb.us-west-2.rds.amazonaws.com/test","nightskycode","uocb4t111");
// boolean reachable = con.isValid(10);// check for connection to DB
} catch (SQLException e) {
e.printStackTrace();
System.out.println("No go!3");
}
return con;
}
public Blob getPhoto(Connection con){
Blob photo = null;
Statement stmt = null;
ResultSet rs = null;
try {
stmt = con.createStatement();
rs = stmt.executeQuery("Select photo from photos where photo_id = 3");
if (stmt.execute("Select photo from photos where photo_id = 3")) {
rs = stmt.getResultSet();
while (rs.next()) { // results here
photo = rs.getBlob("photo");
System.out.println(rs.getString("photo")); }
}
}
catch (SQLException ex){
// handle any errors
System.out.println("SQLException: " + ex.getMessage());
System.out.println("SQLState: " + ex.getSQLState());
System.out.println("VendorError: " + ex.getErrorCode());
}
return photo;
}
**here is the trace**
Dec 22, 2013 9:29:35 PM org.apache.catalina.core.StandardWrapperValve invoke
在java.lang.Thread.run（未知源代码）中，System.out.println（rs.getString（“photo”）；中没有任何内容？尝试System.out.println（照片）；结果仍然为空吗？不，我有一个结果，结果是：java.io。BufferedInputStream@26a1c72bhave您尝试检索其他内容以检查与DB的连接是否正常工作？正常工作，我正在获取java.io。BufferedInputStream@26a1c72b从我的数据库。数据库连接正常