chartviewerservlet.java

来自「jfreechart不错的教程例子谢谢!」· Java 代码 · 共 46 行

package com.segsec.chart.servlet;

import java.awt.image.BufferedImage;
import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.keypoint.PngEncoder;

public class ChartViewerServlet extends HttpServlet {
	public void init() throws ServletException {
	}

	// Process the HTTP Get request
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		// get the chart from session
		HttpSession session = request.getSession();
		BufferedImage chartImage = (BufferedImage) session
				.getAttribute("chartImage");
		// set the content type so the browser can see this as a picture
		response.setContentType("image/png");
		// send the picture
		PngEncoder encoder = new PngEncoder(chartImage, false, 0, 9);
		response.getOutputStream().write(encoder.pngEncode());
	}

	// Process the HTTP Post request
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doGet(request, response);
	}

	// Process the HTTP Put request
	public void doPut(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
	}

	// Clean up resources
	public void destroy() {
	}
}