移除未使用的field；sql语句中只有使用过的field才拼接

src/main/java/com/uas/report/crystal2jasper/CrystalToJasper.java

@@ -232,9 +232,10 @@ public class CrystalToJasper {
 			map(rptXmlFile, subReportFile, styleFile);
 			// 修改报表名称
 			modifyReportName(subReportFile, subReportName);
-			// 修改查询语句
-			String queryString = parseQueryString(rptXmlFile);
-			modifyQueryString(subReportFile, queryString);
+			// 处理查询语句
+			processQueryString(rptXmlFile, subReportFile);
+			// 移除模板中多余field
+			removeUnusedFields(subReportFile);
 			// 移除模板中多余变量
 			removeUnusedVariables(subReportFile);
 		}
@@ -245,9 +246,10 @@ public class CrystalToJasper {
 		map(rptXmlFile, reportFile, styleFile);
 		// 修改报表名称
 		modifyReportName(reportFile, reportName);
-		// 修改查询语句
-		String queryString = parseQueryString(rptXmlFile);
-		modifyQueryString(reportFile, queryString);
+		// 处理查询语句
+		processQueryString(rptXmlFile, reportFile);
+		// 移除模板中多余field
+		removeUnusedFields(reportFile);
 		// 移除模板中多余变量
 		removeUnusedVariables(reportFile);
 		// 替换子报表路径
@@ -322,6 +324,54 @@ public class CrystalToJasper {
 		saveXmlFile(document, jrxmlFile);
 	}
 
+	/**
+	 * 移除模板中多余field
+	 * 
+	 * @param jrxmlFile
+	 *            报表
+	 * @throws DocumentException
+	 * @throws IOException
+	 */
+	@SuppressWarnings("unchecked")
+	private void removeUnusedFields(File jrxmlFile) throws DocumentException, IOException {
+		Set<String> usedFields = getUsedFields(jrxmlFile);
+		if (!CollectionUtils.isEmpty(usedFields)) {
+			Document document = new SAXReader().read(jrxmlFile);
+			List<Element> elements = document.selectNodes("//*[name()='field']");
+			for (Element element : elements) {
+				String columnName = element.attributeValue("name");
+				// field未实际使用，移除元素
+				if (!usedFields.contains(columnName.toUpperCase())) {
+					element.getParent().remove(element);
+				}
+			}
+			saveXmlFile(document, jrxmlFile);
+		}
+	}
+
+	/**
+	 * 获取模板中实际使用的Field
+	 * 
+	 * @param jrxmlFilePath
+	 * @return
+	 * @throws IOException
+	 */
+	private Set<String> getUsedFields(File jrxmlFile) throws IOException {
+		BufferedReader bufferedReader = new BufferedReader(new FileReader(jrxmlFile));
+		String line = null;
+		Set<String> result = new HashSet<>();
+		while ((line = bufferedReader.readLine()) != null) {
+			// 格式为$F{PD_TOTAL}
+			Pattern pattern = Pattern.compile("\\$F\\{([^\\$]*)\\}");
+			Matcher matcher = pattern.matcher(line);
+			while (matcher.find()) {
+				result.add(matcher.group(1).toUpperCase());
+			}
+		}
+		bufferedReader.close();
+		return result;
+	}
+
 	/**
 	 * 移除模板中多余变量
 	 * 
@@ -408,11 +458,15 @@ public class CrystalToJasper {
 	 * 
 	 * @param rptXmlFile
 	 *            rpt的xml文件
+	 * @param jrxmlFile
+	 *            报表
 	 * @return sql查询语句
 	 * @throws DocumentException
+	 * @throws IOException
 	 */
 	@SuppressWarnings("unchecked")
-	private String parseQueryString(File rptXmlFile) throws DocumentException {
+	private String parseQueryString(File rptXmlFile, File jrxmlFile) throws DocumentException, IOException {
+		Set<String> usedFields = getUsedFields(jrxmlFile);
 		Document document = new SAXReader().read(rptXmlFile);
 
 		// 字段
@@ -436,7 +490,10 @@ public class CrystalToJasper {
 			List<String> columns = new ArrayList<>();
 			for (Element columnElement : columnElements) {
 				String columnName = columnElement.attribute("name").getText();
-				columns.add(columnName);
+				// 实际使用过的列才拼接到sql中
+				if (usedFields.contains((alias + "." + columnName).toUpperCase())) {
+					columns.add(columnName);
+				}
 			}
 			columnNames.put(alias, columns);
 		}
@@ -637,16 +694,17 @@ public class CrystalToJasper {
 	/**
 	 * 修改queryString节点
 	 * 
+	 * @param rptXmlFile
+	 *            rpt的xml文件
 	 * @param jrxmlFile
 	 *            报表
-	 * @param queryString
-	 *            queryString的值
 	 * @throws DocumentException
 	 * @throws IOException
 	 */
-	private void modifyQueryString(File jrxmlFile, String queryString) throws DocumentException, IOException {
+	private void processQueryString(File rptXmlFile, File jrxmlFile) throws DocumentException, IOException {
 		Document document = new SAXReader().read(jrxmlFile);
 		Node node = document.selectSingleNode("//*[name()='queryString']");
+		String queryString = parseQueryString(rptXmlFile, jrxmlFile);
 		node.setText(queryString);
 		saveXmlFile(document, jrxmlFile);
 	}