Changes between Initial Version and Version 1 of PDFWithJasperReports

Timestamp:

Oct 19, 2008, 9:42:55 AM (16 years ago)

Author:

soroosh

Comment:

--

PDFWithJasperReports

@@ +1 @@
+If you need to create high-quality PDF reports, you can use JasperReports with django. JasperReports is writen in Java, so I wrote a TCP client to connect to a JasperReports server.
+This is TCP client code which connects to a jasper server listening on port 5000 and is part of your django application:
+{{{
+
+import settings
+import socket, pickle
+
+class BridgeClient:
+    def __init__(self, f):
+        self._sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+        self._sock.connect(("127.0.0.1",5000))
+        packet = pickle.dumps(f)
+        self._sock.send(str(len(packet))+"\n"+packet)
+        size = int(self._readline())
+        self.raw = self._readbytes(size)
+        self._sock.close()
+
+    def get_result(self):
+        return (self.raw)
+
+    def _readline(self):
+        chars = []
+        while 1:
+            try:
+                char = self._sock.recv(1)
+            except:
+                char = ''
+            if char == '\n':
+                break
+            chars.append(char)
+        return "".join(chars)
+    
+    def _readbytes(self, n):
+        chunks = []
+    
+        while n > 0:
+            try:
+                chunk = self._sock.recv(n)
+            except:
+                chunk = None
+            if not chunk:
+                raise ServerError("Failed to read response from server")
+            chunks.append(chunk)
+            n -= len(chunk)
+        return "".join(chunks)
+
+def get_report(report, params):
+    return report_client.BridgeClient({"report": settings.REPORT_DIR + report,
+                                       "params": params,
+                                       }).get_result()
+
+}}}
+
+You also need jython to run JasperReport TCP server. Here is the code in Jython:
+{{{
+import SocketServer
+import pickle
+import org.postgresql.Driver
+from java.sql.DriverManager import *
+import sys
+import os.path
+import traceback
+
+PATH = (os.path.abspath(os.path.dirname(os.path.realpath(__file__))))
+sys.path.append(PATH+"/../")
+import settings
+
+from java.util import HashMap;
+from net.sf.jasperreports.engine import JasperFillManager,JasperExportManager
+from java.lang import System
+import java.io.ByteArrayOutputStream
+import java.io.FileOutputStream
+from net.sf.jasperreports.engine import JRParameter
+import java.util.Locale
+
+class BridgeRequestHandler(SocketServer.BaseRequestHandler):
+    def handle(self):
+        try:
+            size = int(self._readline())
+            data = self._readbytes(size)
+            params = pickle.loads(data)
+            host = ""
+            if settings.DATABASE_HOST:
+                if settings.DATABASE_PORT:
+                    host = "//%s:%s/" % (settings.DATABASE_HOST,
+                                         str(settings.DATABASE_PORT))
+                else:
+                    host = "//%s/" % settings.DATABASE_HOST
+
+            connection = getConnection("jdbc:postgresql:"+ host +
+                                       settings.DATABASE_NAME,
+                                       settings.DATABASE_USER,
+                                       settings.DATABASE_PASSWORD)
+            h = HashMap()
+            for k, v in params["params"].items():
+                h.put(k,v)
+            h.put(JRParameter.REPORT_LOCALE, java.util.Locale("fa"))
+            report = JasperFillManager.fillReport(params["report"], h, connection)
+            output = java.io.ByteArrayOutputStream()
+            JasperExportManager.exportReportToPdfStream(report, output)
+            output.close()
+            data =output.toByteArray()
+        except:
+            self.request.send("0\n")
+            print traceback.print_exc()
+        else:
+            self.request.send(str(len(data))+"\n")
+            self.request.send(data)
+
+    def _readline(self):
+        chars = []
+        while 1:
+            try:
+                char = self.request.recv(1)
+            except:
+                char = ''
+            if not char:
+                self._logException(4, "failed to read response line")
+                raise ServerError("Failed to read server reply header")
+            if char == '\n':
+                break
+            chars.append(char)
+        return "".join(chars)
+    
+    def _readbytes(self, n):
+        chunks = []
+    
+        while n > 0:
+            try:
+                chunk = self.request.recv(1)
+            except:
+                chunk = None
+            if not chunk:
+                raise ServerError("Failed to read response from server")
+            chunks.append(chunk)
+            n -= len(chunk)
+        return "".join(chunks)
+
+#server host is a tuple ('host', port)
+server = SocketServer.TCPServer(('localhost', 5000), BridgeRequestHandler)
+server.serve_forever()
+}}}
+You need to have these jar files in your classpath: ["itext-1.4.5.jar", "log4j-1.2.jar", "commons-logging.jar", "icu4j.jar", "commons-collections.jar", "commons-digester.jar", "commons-beanutils.jar", "jasperreports-3.0.0.jar"] + JDBC driver to connect to database
+
+And this is a sample view {{{
+
+def hello_pdf(request):
+    response = HttpResponse(mimetype='application/pdf')
+    response['Content-Disposition'] = 'attachment; filename="hello_world.pdf"'
+    response.write(get_report("hello.jasper", {
+                "title": (u"hello world"),
+                }))
+    return response
+}}}