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1
21 package com.jaspersoft.jasperserver.war.action;
22
23 import java.io.IOException  ;
24 import java.io.OutputStream ;
25 import java.util.HashMap ;
26 import java.util.Map ;
27
28 import javax.servlet.ServletOutputStream ;
29 import javax.servlet.http.HttpServletResponse ;
30
31 import net.sf.jasperreports.engine.JRException;
32 import net.sf.jasperreports.engine.JRExporterParameter;
33 import net.sf.jasperreports.engine.JasperPrint;
34
35 import org.apache.commons.logging.Log;
36 import org.apache.commons.logging.LogFactory;
37 import org.springframework.webflow.AttributeMap;
38 import org.springframework.webflow.Event;
39 import org.springframework.webflow.RequestContext;
40 import org.springframework.webflow.action.MultiAction;
41 import org.springframework.webflow.context.servlet.ServletExternalContext;
42
43 import com.jaspersoft.jasperserver.api.common.domain.ExecutionContext;
44 import com.jaspersoft.jasperserver.war.common.FileBufferedOutputStream;
45 import com.jaspersoft.jasperserver.war.common.JasperServerUtil;
46
47
51 public abstract class AbstractReportExporter extends MultiAction {
52
53 private static final Log log = LogFactory.getLog(AbstractReportExporter.class);
54
55 private String flowAttributeJasperPrintSessionName;
56 private String flowAttributeReportUnitURI;
57 private boolean setResponseContentLength = true;
58 private int memoryThreshold = FileBufferedOutputStream.DEFAULT_MEMORY_THRESHOLD;
59 private int initialMemoryBufferSize = FileBufferedOutputStream.DEFAULT_INITIAL_MEMORY_BUFFER_SIZE;
60
61 public Event export(RequestContext context) throws IOException , JRException {
62 ServletExternalContext servletContext = (ServletExternalContext) context.getExternalContext();
63 HttpServletResponse response = servletContext.getResponse();
64
65 AttributeMap flowAttrs = context.getFlowScope();
66 String jasperPrintSessionName = flowAttrs.getRequiredString(getFlowAttributeJasperPrintSessionName());
67 JasperPrint jasperPrint = (JasperPrint) servletContext.getSessionMap().getRequired(jasperPrintSessionName, JasperPrint.class);
68 String reportUnitURI = flowAttrs.getRequiredString(getFlowAttributeReportUnitURI());
69
70 if (setResponseContentLength)
71 {
72 exportBuffered(context, response, jasperPrint, reportUnitURI);
73 }
74 else
75 {
76 exportToStream(context, response, jasperPrint, reportUnitURI);
77 }
78
79 return success();
80 }
81
82 protected void exportToStream(RequestContext context, HttpServletResponse response, JasperPrint jasperPrint, String reportUnitURI) throws IOException , JRException {
83 Map parameters = new HashMap ();
84 parameters.put(JRExporterParameter.JASPER_PRINT, jasperPrint);
85
86 OutputStream ouputStream = response.getOutputStream();
87 parameters.put(JRExporterParameter.OUTPUT_STREAM, ouputStream);
88
89 try
90 {
91 response.setContentType(getContentType(context));
92 setAdditionalResponseHeaders(context, response);
93 export(context, getExecutionContext(context), reportUnitURI, parameters);
94 }
95 finally
96 {
97 if (ouputStream != null)
98 {
99 try
100 {
101 ouputStream.close();
102 }
103 catch (IOException ex)
104 {
105 log.warn("Error closing output stream", ex);
106 }
107 }
108 }
109 }
110
111 protected ExecutionContext getExecutionContext(RequestContext context) {
112 return JasperServerUtil.getExecutionContext(context);
113 }
114
115 protected void exportBuffered(RequestContext context, HttpServletResponse response, JasperPrint jasperPrint, String reportUnitURI) throws IOException , JRException {
116 Map parameters = new HashMap ();
117 parameters.put(JRExporterParameter.JASPER_PRINT, jasperPrint);
118
119 FileBufferedOutputStream bufferedOutput = new FileBufferedOutputStream(getMemoryThreshold(), getInitialMemoryBufferSize());
120 parameters.put(JRExporterParameter.OUTPUT_STREAM, bufferedOutput);
121
122 try {
123 export(context, getExecutionContext(context), reportUnitURI, parameters);
124 bufferedOutput.close();
125
126 response.setContentType(getContentType(context));
127 setAdditionalResponseHeaders(context, response);
128 response.setContentLength(bufferedOutput.size());
129 ServletOutputStream ouputStream = response.getOutputStream();
130
131 try {
132 bufferedOutput.writeData(ouputStream);
133 bufferedOutput.dispose();
134
135 ouputStream.flush();
136 } finally {
137 if (ouputStream != null) {
138 try {
139 ouputStream.close();
140 }
141 catch (IOException ex) {
142 log.warn("Error closing output stream", ex);
143 }
144 }
145 }
146 } finally {
147 bufferedOutput.close();
148 bufferedOutput.dispose();
149 }
150 }
151
152 public String getFlowAttributeJasperPrintSessionName() {
153 return flowAttributeJasperPrintSessionName;
154 }
155
156 public void setFlowAttributeJasperPrintSessionName(String requestAttributeJasperPrint) {
157 this.flowAttributeJasperPrintSessionName = requestAttributeJasperPrint;
158 }
159
160 public String getFlowAttributeReportUnitURI() {
161 return flowAttributeReportUnitURI;
162 }
163
164 public void setFlowAttributeReportUnitURI(
165 String requestAttributeReportUnitURI) {
166 this.flowAttributeReportUnitURI = requestAttributeReportUnitURI;
167 }
168
169 public boolean isSetResponseContentLength() {
170 return setResponseContentLength;
171 }
172
173 public void setSetResponseContentLength(boolean setResponseContentLength) {
174 this.setResponseContentLength = setResponseContentLength;
175 }
176
177 public int getInitialMemoryBufferSize() {
178 return initialMemoryBufferSize;
179 }
180
181 public int getMemoryThreshold() {
182 return memoryThreshold;
183 }
184
185 public void setMemoryThreshold(int memoryThreshold) {
186 this.memoryThreshold = memoryThreshold;
187 }
188
189 public void setInitialMemoryBufferSize(int initialMemoryBufferSize) {
190 this.initialMemoryBufferSize = initialMemoryBufferSize;
191 }
192
193
194 protected abstract String getContentType(RequestContext context);
195
196 protected abstract void setAdditionalResponseHeaders(RequestContext context, HttpServletResponse response);
197
198 protected abstract void export(RequestContext context, ExecutionContext executionContext, String reportUnitURI, Map baseParameters) throws JRException;
199
200 }
201 |
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