Javascript 使用Geoext+打印地图；地理服务器

我正在尝试使用GeoEXT和geoserver打印地图我成功显示打印面板，但单击打印按钮时出现以下错误：

      Error while generating PDF:
 org.mapfish.print.InvalidJsonValueException: spec.pages[0].dpi has an invalid value: 0
at org.mapfish.print.config.layout.MapBlock.createTransformer(MapBlock.java:79)
at org.mapfish.print.config.layout.MapBlock.render(MapBlock.java:51)
at org.mapfish.print.config.layout.Page.render(Page.java:65)
at org.mapfish.print.config.layout.MainPage.render(MainPage.java:62)
at org.mapfish.print.config.layout.Layout.render(Layout.java:59)
at org.mapfish.print.MapPrinter.print(MapPrinter.java:144)
at      org.mapfish.print.servlet.MapPrinterServlet.doCreatePDFFile(MapPrinterServlet.java:275)
at org.mapfish.print.servlet.MapPrinterServlet.createAndGetPDF(MapPrinterServlet.java:130)
at org.mapfish.print.servlet.MapPrinterServlet.doGet(MapPrinterServlet.java:68)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.springframework.web.servlet.mvc.ServletWrappingController.handleRequestInternal(ServletWrappingController.java:159)
at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:153)
at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1093)
at org.geoserver.filters.ThreadLocalsCleanupFilter.doFilter(ThreadLocalsCleanupFilter.java:23)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
at org.geoserver.filters.SpringDelegatingFilter$Chain.doFilter(SpringDelegatingFilter.java:74)
at org.geoserver.filters.SpringDelegatingFilter.doFilter(SpringDelegatingFilter.java:45)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
at org.geoserver.platform.AdvancedDispatchFilter.doFilter(AdvancedDispatchFilter.java:49)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
at org.vfny.geoserver.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:109)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:311)
at org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:68)
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:116)
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83)
at org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:72)
at org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:91)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
at org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:68)
at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)
at org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:72)
at org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:91)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
at org.geoserver.security.filter.GeoServerAnonymousAuthenticationFilter.doFilter(GeoServerAnonymousAuthenticationFilter.java:53)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
at org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:68)
at org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:150)
at org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:72)
at org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:91)
at org.geoserver.security.filter.GeoServerBasicAuthenticationFilter.doFilter(GeoServerBasicAuthenticationFilter.java:82)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
at org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:68)
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
at org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:72)
at org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:91)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:173)
at org.geoserver.security.GeoServerSecurityFilterChainProxy.doFilter(GeoServerSecurityFilterChainProxy.java:97)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
at org.geoserver.filters.LoggingFilter.doFilter(LoggingFilter.java:71)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
at org.geoserver.filters.GZIPFilter.doFilter(GZIPFilter.java:41)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
at org.geoserver.filters.SessionDebugFilter.doFilter(SessionDebugFilter.java:46)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:726)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:324)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:828)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
at org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:228)
at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:450)

我知道它太长了，但我不知道问题发生在哪里，当我尝试访问MapBlock.java第79行时，我没有尝试过的源代码（未找到） 我的html页面是：

    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
      <html>
      <head>
     <title>
      A map
     </title>
    <script src="../ext-3.4.1/adapter/ext/ext-base.js"" type="text/javascript"></script>
   <script src="../ext-3.4.1/ext-all.js" type="text/javascript"></script>
   <link rel="stylesheet" type="text/css" href="../ext-3.4.1/resources/css/ext-all.css">
   <script src="../openlayers/OpenLayers.js" type="text/javascript"></script>
   <script src="../openlayers/lib/deprecated.js" type="text/javascript"></script>
   <script src="../GeoExt/lib/GeoExt.js" type="text/javascript"></script>
   <link rel="stylesheet" type="text/css" href="../GeoExt/resources/css/geoext-all-debug.css">
    <script src="http://maps.google.com/maps/api/js?v=3&amp;sensor=false"></script>

 <script type="text/javascript">

  var mapPanel, printDialog;

        Ext.onReady(function() {
  // The PrintProvider that connects us to the print service
  var printProvider = new GeoExt.data.PrintProvider({   
  method: "GET", // "POST" recommended for production use
  url: "http://localhost:8080/geoserver/pdf/info.json?var=printCapabilities", 
   customParams: {
    mapTitle: "GeoExt Printing Demo",
    comment: "This demo shows how to use GeoExt.PrintMapPanel"
  }
 });

   // A MapPanel with a "Print..." button
  mapPanel = new GeoExt.MapPanel({
renderTo: "content",
width: 500,
height: 350,
map: {
    maxExtent: new OpenLayers.Bounds(
        143.835, -43.648,
        148.479, -39.574
    ),
    maxResolution: 0.018140625,
    projection: "EPSG:4326",
    units: 'degrees'
},
layers: [new OpenLayers.Layer.WMS("Tasmania State Boundaries",
    "http://demo.opengeo.org/geoserver/wms",
    {layers: "topp:tasmania_state_boundaries"},
    {singleTile: true, numZoomLevels: 8})],
center: [146.56, -41.56],
zoom: 0,
bbar: [{
    text: "Print...",
    handler: function(){
        // A window with the PrintMapPanel, which we can use to adjust
        // the print extent before creating the pdf.
        printDialog = new Ext.Window({
            title: "Print Preview",
            layout: "fit",
            width: 350,
            autoHeight: true,
            items: [{
                xtype: "gx_printmappanel",
                sourceMap: mapPanel,
                printProvider: printProvider
            }],
            bbar: [{
                text: "Create PDF",
                handler: function(){ printDialog.items.get(0).print(); }
            }]
        });
        printDialog.show();
    }
     }]
   });

   });

  </script>
  </head>
 <body>
  <div id='content'></div>
  </body>
 </html>

地图
例外情况说明：

spec.pages[0]。dpi的值无效：0

您需要检查两件事：

您是否在yaml文件中配置了DPI？请使用url检查此项：

http://localhost:8080/geoserver/pdf/info.json?var=printCapabilities


如果是，请确保发送到geoserver的打印url已声明dpi，例如我的：