java处理图片问题

Question

各位，用java程序可以生成图片吗？用什么方法啊，，我现在一点思路都没有。求各位大虾给个思路。。            谢谢了！

Answer 1

可以。一下是一段生成验证码图片的jsp代码，希望对你有帮助。<%@ page import="java.util.Random"%><%@ page
import="java.io.OutputStream"%><%@ page import="java.awt.Color"%><%@ page
import="java.awt.Font"%><%@ page import="java.awt.Graphics"%><%@ page
import="java.awt.image.BufferedImage"%><%@ page
import="javax.imageio.ImageIO"%>
<%@ page
import="....SessionKeyConstant"%>
<%
int width = 60;
int height = 22;
//create the image
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics g = image.getGraphics();
// set the background color
g.setColor(new Color(0xDCDCDC));
g.fillRect(0, 0, width, height);
// draw the border
g.setColor(Color.black);
g.drawRect(0, 0, width - 1, height - 1);
// create a random instance to generate the codes
Random rdm = new Random();
String hash1 = Integer.toHexString(rdm.nextInt());
// make some confusion
for (int i = 0; i < 50; i++)
{
int x = rdm.nextInt(width);
int y = rdm.nextInt(height);
g.drawOval(x, y, 0, 0);
}
// generate a random code
String capstr = hash1.substring(0, 4);
session.setAttribute(SessionKeyConstant.VALIDATECODE, capstr);
g.setColor(new Color(0, 100, 0));
g.setFont(new Font("Times New Roman", Font.PLAIN, 20));
g.drawString(capstr, 11, 17);
g.dispose();
response.setContentType("image/jpeg");
out.clear();
out = pageContext.pushBody();
OutputStream strm = response.getOutputStream();
ImageIO.write(image, "jpeg", strm);
strm.close();
%>

Answer 2

你要生成什么图片啊，我见过的java生成的图片就是验证码，还有jfreechart生成的报表图片

Answer 3

用Servlet生成动态图片，java程序生成动态图片的例子
Java代码
    package servlet;  //包名  
      
    import java.awt.*;  
    import java.awt.image.*;  
    import com.sun.image.codec.jpeg.*;  
    import java.io.IOException;  
      
    import javax.servlet.*;  
    import javax.servlet.http.*;  
      
    public class JPEGServlet extends HttpServlet {  
      
     private static final long serialVersionUID = 1L;  
      
     public void doGet(HttpServletRequest request, HttpServletResponse response)  
       throws ServletException, IOException {  
      
      response.setContentType("image/jpeg");  
      ServletOutputStream out = response.getOutputStream();  
      BufferedImage image = new BufferedImage(750, 30, BufferedImage.TYPE_INT_RGB);  
      int per = 0;  
      try  
      {  
       per = Integer.parseInt((String)request.getParameter("size"));//接收参数，表示进度  
      }  
      catch(Exception e)  
      {  
       e.printStackTrace();  
      }  
        
      Graphics graphics = image.getGraphics();  
      graphics.setColor(Color.green);  
      graphics.fillRect(0, 0, 750, 30);  
      graphics.setColor(Color.yellow);  
      graphics.fillRect(0, 0, 750 * per / 100, 30);  
      JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);  
      encoder.encode(image);  
      out.close();  
     }  
      
     public void doPost(HttpServletRequest request, HttpServletResponse response)  
       throws ServletException, IOException {  
      
      doGet(request, response);  
     }  
      
    }  
web.xml    <servlet>  
       <servlet-name>jpegServlet</servlet-name>             
       <servlet-class>servlet.JPEGServlet</servlet-class>
    </servlet>  
      
    <servlet-mapping>  
       <servlet-name>jpegServlet</servlet-name>
       <url-pattern>/picture</url-pattern>
    </servlet-mapping>  JSP
<jsp:include page="/picture" flush="true">  
   <jsp:param name="size" value="33">//这里value值当然就可以是个变量了  
</jsp:inclue>访问： http://localhost:8088/工程名称/picture?size=33

Answer 4

使用AJAX和Struts2生成图片：
struts.xml配置
<package name="stuts-test" extends="struts-default" namespace="/">    <action name="pic" class="action.PictureAction" method="createPicture"></action></package>Action：
package action;
import java.awt.Color;import java.awt.Graphics;import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;import javax.servlet.ServletOutputStream;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
@SuppressWarnings("serial")public class PictureAction extends ActionSupport {
    public void createPicture() throws Exception {        BufferedImage image = new BufferedImage(200, 200, BufferedImage.TYPE_INT_RGB);        Graphics g = image.getGraphics();        g.setColor(Color.WHITE);        g.fillOval(50, 50, 100, 100);
        ServletActionContext.getResponse().setContentType("image/png");        ServletOutputStream out = ServletActionContext.getResponse().getOutputStream();        ImageIO.write(image, "png", out);        out.close();    }}页面：
<html><head>    <meta http-equiv="Content-type" content="text/html; charset=utf-8">    <title>Title</title>
    <script src="jquery.js"></script>    <script type="text/javascript">    $(function() {        $("#ajaxImg").attr("src", "pic.action");    });    </script></head>
<body>    <img id="ajaxImg" /></body></html>

Answer 5

使用AJAX和Struts2生成图片：
struts.xml配置<package name="stuts-test" extends="struts-default" namespace="/">  <action name="pic" class="action.PictureAction" method="createPicture"></action></package>
Action：
package action;
import java.awt.Color;import java.awt.Graphics;import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;import javax.servlet.ServletOutputStream;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
@SuppressWarnings("serial")public class PictureAction extends ActionSupport {
  public void createPicture() throws Exception {  BufferedImage image = new BufferedImage(200, 200, BufferedImage.TYPE_INT_RGB);  Graphics g = image.getGraphics();  g.setColor(Color.WHITE);  g.fillOval(50, 50, 100, 100);
  ServletActionContext.getResponse().setContentType("image/png");  ServletOutputStream out = ServletActionContext.getResponse().getOutputStream();  ImageIO.write(image, "png", out);  out.close();  }}
页面：
<html><head>  <meta http-equiv="Content-type" content="text/html; charset=utf-8">  <title>Title</title>
  <script src="jquery.js"></script>  <script type="text/javascript">  $(function() {  $("#ajaxImg").attr("src", "pic.action");  });  </script></head>
<body>  <img id="ajaxImg" /></body></html>**********************************************************************************
用Servlet生成动态图片，java程序生成动态图片的例子
Java代码
  
package servlet; //包名   
    
  import java.awt.*;   
  import java.awt.image.*;   
  import com.sun.image.codec.jpeg.*;   
  import java.io.IOException;   
    
  import javax.servlet.*;   
  import javax.servlet.http.*;   
    
  public class JPEGServlet extends HttpServlet {   
    
  private static final long serialVersionUID = 1L;   
    
  public void doGet(HttpServletRequest request, HttpServletResponse response)   
  throws ServletException, IOException {   
    
  response.setContentType("image/jpeg");   
  ServletOutputStream out = response.getOutputStream();   
  BufferedImage image = new BufferedImage(750, 30, BufferedImage.TYPE_INT_RGB);   
  int per = 0;   
  try   
  {   
  per = Integer.parseInt((String)request.getParameter("size"));//接收参数，表示进度   
  }   
  catch(Exception e)   
  {   
  e.printStackTrace();   
  }   
    
  Graphics graphics = image.getGraphics();   
  graphics.setColor(Color.green);   
  graphics.fillRect(0, 0, 750, 30);   
  graphics.setColor(Color.yellow);   
  graphics.fillRect(0, 0, 750 * per / 100, 30);   
  JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);   
  encoder.encode(image);   
  out.close();   
  }   
    
  public void doPost(HttpServletRequest request, HttpServletResponse response)   
  throws ServletException, IOException {   
    
  doGet(request, response);   
  }   
    
  }   
web.xml  <servlet>   
  <servlet-name>jpegServlet</servlet-name>   
  <servlet-class>servlet.JPEGServlet</servlet-class>
  </servlet>   
    
  <servlet-mapping>   
  <servlet-name>jpegServlet</servlet-name>
  <url-pattern>/picture</url-pattern>
  </servlet-mapping>   JSP
<jsp:include page="/picture" flush="true">   
  <jsp:param name="size" value="33">//这里value值当然就可以是个变量了   
</jsp:inclue>访问： http://localhost:8088/工程名称/picture?size=33

Answer 6

这里有几个 java生成图片的例子
http://zhidao.baidu.com/question/76579507.htmlhttp://edu.codepub.com/2010/0421/22159.phphttp://cache.baidu.com/c?m=9d78d513d99b12eb0bfa950e1a67dc716d2797133dc0a11e68d5e35fe2124c31367192bf30516110948522685be90f1efdf1456f2a537eeacedf883ddebf933f2fff76692f01d816458344e48a157adc70ce07bcb258a1e9b669c2b3d2d0d95758cc51057882f48a590717c868f41533e1bb&p=c962c816d9c411a059eac83a517a&user=baidu&fm=sc&query=java%C9%FA%B3%C9%CD%BC%C6%AC&qid=ece03cee0c50334c&p1=13
http://cache.baidu.com/c?m=9d78d513d99b12eb0bfa950e1a67dc716d2797133dc0a11e68d5e35fe2124c31367192bf30516110948522685be90f1efdf1456f2a597ba09bbfd81986edd53f2fff76692f01de12568053e8970c629d3dc004b4fa04bcfca76d8ef984d18e54009c07077cd6fb805d07169b3ea04032b0a4ce5f15284afcb26e&p=8371d210c89c12a05ebd9b7e0b59&user=baidu&fm=sc&query=java%C9%FA%B3%C9%CD%BC%C6%AC&qid=ece03cee0c50334c&p1=11