本文通過Java代碼調用Shell腳本並傳入參數實現DB2數據庫表導出到文件，代碼如下：
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.LineNumberReader;
import java.util.HashMap;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.*.dmp.bean.AgentConfigInfo;
import com.*.dmp.bean.MapKeys;
import com.*.dmp.bean.RunStatus;
import com.*.dmp.common.SpringUtils;
public class ExportDataServiceDB2 {
AgentConfigInfo agentConfigInfo = SpringUtils.getContext().getBean(AgentConfigInfo.class);
private Logger LOG = LoggerFactory.getLogger(ExportDataServiceDB2.class);
private StringBuffer resultMsg = new StringBuffer();
String isOK = "0";
private String exportShell = agentConfigInfo.getEXPORT_SHELL();
// private String exportCMD = agentConfigInfo.getEXPORT_CMD();
private StringBuffer exportFilePath = agentConfigInfo.getEXPORT_FILE_PATH();
/**
* @Title: ExportData
* @Description: 調用Shell腳本實現db2數據的導出
* @param dataMap
* @throws IOException 對方法的參數進行描述
* @return HashMap<String,String> 返回類型
*/
public HashMap<String, String> ExportData(HashMap<String, String> dataMap) throws IOException {
String dbSchema = dataMap.get("db_schema");
String dbUser = dataMap.get("db_user");
String dbPassword = dataMap.get("db_password");
String tableName = dataMap.get("table_name");
String interFile = dataMap.get("inter_file");
String delimiter = dataMap.get("delimiter");
String exportLimit = dataMap.get("export_limit");
String filePath = mkDirectory(exportFilePath, interFile);
dataMap.put("file_abs_path", filePath);
String cmdPara = createExportShellParams(dbSchema, dbUser,
dbPassword, tableName, filePath, delimiter, exportLimit);
LOG.info("Export Parameters: " + cmdPara);
resultMsg.append("Export Parameters: " + cmdPara + "\n");
String cmd = exportShell + " " + cmdPara;
Process ps = null;
InputStreamReader isr = null;
LineNumberReader input = null;
String line = null;
try {
LOG.info("Run Command: " + cmd );
resultMsg.append("Run Command: " + cmd + "\n");
ps = Runtime.getRuntime().exec(cmd);
isr = new InputStreamReader(ps.getInputStream()); // 使用Reader進行輸入讀取和打印
input = new LineNumberReader(isr);
while (null != (line = input.readLine())) {
LOG.info(line);
resultMsg.append(line);
if (line.contains("failed") || line.contains("Failed") || line.contains("FAILED") || line.contains("錯誤")) {
isOK = RunStatus.EXPORT_FAIL;
dataMap.put("export_status", isOK);
dataMap.put("proc_log", resultMsg.toString());
// dataMap = packageResult(isOK, resultMsg.toString()); // 組裝返回的消息
return dataMap;
} else {
isOK = RunStatus.PROC_RUN_SUCCESS;
}
}
// if (0 != ps.waitFor()) {
// isOK = RunStatus.EXPORT_FAIL;
// } else {
// isOK = RunStatus.PROC_RUN_SUCCESS;
// }
} catch (IOException e) {
LOG.error("Run the Command Exception: " + cmd + ": " + e.getMessage());
resultMsg.append("Run the Command Exception: " + cmd + ": " + e.getMessage() + "\n");
isOK = RunStatus.EXPORT_FAIL;
} finally {
if (null != input) {
input.close();
}
if (null != isr) {
isr.close();
}
if (null != ps) {
ps.destroy();
ps = null;
}
}
dataMap.put("export_status", isOK);
dataMap.put("proc_log", resultMsg.toString());
// dataMap = packageResult(isOK, resultMsg.toString()); // 組裝返回的消息
return dataMap;
}
/**
* @Title: createExportShellParams
* @Description: 組裝參數
* @param msgId
* @param dbSchema
* @param dbUser
* @param dbPassword
* @param tableName
* @param filePath
* @param delimiter
* @param exportLimit
* @return String 返回類型
* @throws
*/
private String createExportShellParams(String dbSchema,
String dbUser, String dbPassword, String tableName,
String filePath, String delimiter, String exportLimit) {
StringBuilder params = new StringBuilder();
params.append(dbSchema + " ").append(dbUser + " ").append(dbPassword + " ")
.append(tableName + " ").append(filePath + " ").append(delimiter + " ").append(exportLimit);
return params.toString();
}
/**
* @Title: mkDirectory
* @Description: 根據配置的路徑和文件名，判斷文件路徑是否存在，若不存在，則先創建，拼接導出文件絕對路徑。
* @param filePath
* @param interFile
* @return 對方法的參數進行描述
* @return String 返回類型
* @throws
*/
private String mkDirectory(StringBuffer filePath, String interFile) {
File file = new File(filePath.toString());
if ( file.isDirectory() ) {
if (filePath.toString().endsWith("/")) {
filePath.append(interFile);
} else {
filePath.append("/").append(interFile);
}
} else {
LOG.info("The file path is not exists, need to be created now. ");
file.mkdir();
if (filePath.toString().endsWith("/")) {
filePath.append(interFile);
} else {
filePath.append("/").append(interFile);
}
}
return filePath.toString();
}
/** 返回消息組裝結果 */
private HashMap<String, String> packageResult(String isOK, String resultMsg) {
HashMap<String, String> hsmap = new HashMap<String, String>();
hsmap.put(MapKeys.PROC_STATUS, isOK);
hsmap.put(MapKeys.PROC_LOG, resultMsg);
return hsmap;
}
}
傳入的執行參數放入一個Map（HashMap<String, String> dataMap）中
/** EXPORT TEST */
map.put("db_schema", "md");
map.put("db_user", "root");
map.put("db_password", "root");
map.put("table_name", "inter_log");
map.put("inter_file", "inter_log_20140915.avl");
map.put("delimiter", "|");
map.put("export_limit", "");
代碼執行之後，將執行日志以及執行結果也存入該Map中一起返回
dataMap.put("export_status", isOK);
dataMap.put("proc_log", resultMsg.toString());
return dataMap;
執行結果界面：
大話設計模式(帶目錄完整版) PDF+源代碼 http://www.linuxidc.com/Linux/2014-08/105152.htm
Java中介者設計模式 http://www.linuxidc.com/Linux/2014-07/104319.htm
Java 設計模式之模板方法開發中應用 http://www.linuxidc.com/Linux/2014-07/104318.htm
設計模式之 Java 中的單例模式（Singleton） http://www.linuxidc.com/Linux/2014-06/103542.htm