shell调用java程序jar找不到main方法

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mob64ca13fb1f2e 2025-01-07 18:48:57

文章标签 开发工具 json java JAVA 文章分类 Java 后端开发

eclipse项目从编程到打jar包到编写BashShell执行

一、创建Java项目，并编写项目（带额外jar包）

二、打jar包

三、编写BashShell执行

一、创建Java项目，并编写项目（带额外jar包）

项目目录如下所示：

shell调用java程序jar找不到main方法_开发工具

代码如下所示：

我设计了三个类，分别是 PersonData.java、Data2Json.java以及 TestData2Json.java，具体代码如下所示：

PersonData.java是个人员数据类，主要存储人员数据的。

package com.zc.dataclass.main;

import java.io.Serializable;

public class PersonData implements Serializable {
    private static final long serialVersionUID = 1L;
    
    private String xm;  //姓名
    private String xb;  //性别
    private String sr;  //生日
    public String getXm() {
        return xm;
    }
    public void setXm(String xm) {
        this.xm = xm;
    }
    public String getXb() {
        return xb;
    }
    public void setXb(String xb) {
        this.xb = xb;
    }
    public String getSr() {
        return sr;
    }
    public void setSr(String sr) {
        this.sr = sr;
    }
    
}

Data2Json.java 主要是将数据类转换成JSON

package com.zc.data2json.trans.main;

import java.util.List;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

/**
 * @author zhangchao
 * @date 2018-08-22
 * 将数据(类)转换成Json格式数据
 */
public class Data2Json {
    /**
     * 将 Object 转换成 JSONObject
     * @param obj
     * @return
     */
    public JSONObject data2JsonObj(Object obj) {
        JSONObject jsonObj = JSONObject.fromObject(obj); 
        return jsonObj;
    }
    
    /* 错误的例子
    public JSONObject data2JsonObj(List<Object> list) {
        JSONObject jsonObj = JSONObject.fromObject(list); 
        return jsonObj;
    }*/
    
    /**
     * 将 Object 转换成 JSONArray
     * @param obj
     * @return
     */
    public JSONArray data2JsonArr(Object obj) {
        JSONArray jsonArr = JSONArray.fromObject(obj); 
        return jsonArr;
    }
    
    /**
     * 将 List<Object> 转换成 JSONArray
     * @param list
     * @return
     */
    public JSONArray data2JsonArr(List<Object> list) {
        JSONArray jsonArr = JSONArray.fromObject(list); 
        return jsonArr;
    }
    
    /*public JSONArray data2JsonArr2(List<Object> list) {
        JSONArray json = new JSONArray();
        for(Object pLog : list){
            JSONObject jo = new JSONObject();
            jo.put("id", pLog.getId());
            jo.put("time", pLog.getBeginTime());
             
            // 注意add和element的区别
            json.add(jo);
        }
        return json;
    }*/
    
    /**
     * 将数组转换成JSONArray
     * @param arr
     * @return
     */
    public JSONArray data2JsonArr(Object[] arr) {
        JSONArray jsonArr = JSONArray.fromObject(arr);
        return jsonArr;
    }
}

TestData2Json.java 测试

package com.zc.data2json.trans.test;

import java.util.ArrayList;
import java.util.List;

import com.zc.data2json.trans.main.Data2Json;
import com.zc.dataclass.main.PersonData;

import net.sf.json.JSONArray;

public class TestData2Json {

    private final static long heartbeat = 10;  // 设置心跳10s
    static long i=1;
    
    public static void main(String[] args) {
        while(true) {
            PersonData pD = getPersonData();
            Data2Json dcj = new Data2Json();
            JSONArray jsonArr = dcj.data2JsonArr(pD);
            System.out.println(jsonArr.toString());
            try {
                Thread.sleep(heartbeat*1000);  //ms
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    /*
     * 获取类数据
     */
    public static PersonData getPersonData() {
        PersonData pd1 = new PersonData();
        pd1.setXm("张"+i++);
        //(数据类型)(最小值+Math.random()*(最大值-最小值+1))
        int sex = (int)(1+Math.random()*(2-1+1));
        if(sex==1)
            pd1.setXb("男");
        else
            pd1.setXb("女");
        pd1.setSr("1991-01-12");
        
        return pd1;
    }
    
    /*
     * 获取类数据
     */
    public static List<PersonData> getPersonDataList() {
        PersonData pd1 = new PersonData();
        pd1.setXm("张"+i++);
        pd1.setXb("男");
        pd1.setSr("1991-01-12");
        
        List<PersonData> pd = new ArrayList<PersonData>();
        pd.add(pd1);
        
        return pd;
    }
}

二、打jar包

用第三种方式打jar包

三、编写BashShell执行

首先先创建一个名为ZcData2Json的文件夹，该文件夹如下所示：

shell调用java程序jar找不到main方法_开发工具_02

bin：其中放着运行程序的脚本文件 data2json
conf：放着配置文件 data2json.conf
data2json：放着第二步生成的jar包以及lib包
lib：用于存放jar包，暂为空
logs：用于存储生成的日志文件
run：用于存储运行进程的pid文件 data2json.pid

data2json文件内容如下所示：

bin中 data2json 内容如下所示：

#!/usr/bin/env bash

# DATA2JSON, 参考neo4j

#版本号
DATA2JSON_VERSION="data2json version \"1.0\""

#获取该文件的名称
declare -r PROGRAM="$(basename "$0")"
#echo $PROGRAM

#获取该文件的路径
bin=`dirname "${BASH_SOURCE-$0}"`
bin=`cd "$bin"; pwd`

# get arguments 获取参数
command=$1
#echo ${command}

# 获取用户名
#执行程序启动所使用的系统用户，考虑到安全，推荐不使用root帐号
#USERNAME=$(users)
USERNAME=$USER
#echo $USERNAME
# 获取主机名
HOSTNAME=$(hostname)
#echo $HOSTNAME

set -o errexit -o nounset -o pipefail
[[ "${TRACE:-}" ]] && set -o xtrace

# Callers may provide the following environment variables to customize this script:
#  * JAVA_HOME
#  * JAVA_OPTS
#  * JAVA_CMD

###################################
#环境变量及程序执行参数
#需要根据实际环境以及Java程序名称来修改这些参数
###################################
#JDK所在路径
#JAVA_HOME=$JAVA_HOME
#JAVA_HOME="/usr/lib/jvm/java"
#echo $JAVA_HOME

# 检测系统
function detect_os() {
  if uname -s | grep -q Darwin; then
    DIST_OS="macosx"
  elif [[ -e /etc/gentoo-release ]]; then
    DIST_OS="gentoo"
  else
    DIST_OS="other"
  fi
}
#detect_os
#echo $DIST_OS

# 检测java
function check_java() {
  _find_java_cmd

  version_command=("${JAVA_CMD}" "-version")
  [[ -n "${JAVA_MEMORY_OPTS:-}" ]] && version_command+=("${JAVA_MEMORY_OPTS[@]}")

  JAVA_VERSION=$("${version_command[@]}" 2>&1 | awk -F '"' '/version/ {print $2}')
  if [[ "${JAVA_VERSION}" < "1.8" ]]; then
    echo "ERROR! DATA2JSON cannot be started using java version ${JAVA_VERSION}. "
    _show_java_help
    exit 1
  fi

  if ! ("${version_command[@]}" 2>&1 | egrep -q "(Java HotSpot\\(TM\\)|OpenJDK|IBM) (64-Bit Server|Server|Client|J9) VM"); then
    echo "WARNING! You are using an unsupported Java runtime. "
    _show_java_help
  fi
}

# 查找Java命令
function _find_java_cmd() {
  [[ "${JAVA_CMD:-}" ]] && return
  detect_os
  _find_java_home

  if [[ "${JAVA_HOME:-}" ]] ; then
    JAVA_CMD="${JAVA_HOME}/bin/java"
    if [[ ! -f "${JAVA_CMD}" ]]; then
      echo "ERROR: JAVA_HOME is incorrectly defined as ${JAVA_HOME} (the executable ${JAVA_CMD} does not exist)"
      exit 1
    fi
  else
    if [ "${DIST_OS}" != "macosx" ] ; then
      # Don't use default java on Darwin because it displays a misleading dialog box
      JAVA_CMD="$(which java || true)"
    fi
  fi

  if [[ ! "${JAVA_CMD:-}" ]]; then
    echo "ERROR: Unable to find Java executable."
    _show_java_help
    exit 1
  fi
}

# 查找Java home目录
function _find_java_home() {
  [[ "${JAVA_HOME:-}" ]] && return

  case "${DIST_OS}" in
    "macosx")
      JAVA_HOME="$(/usr/libexec/java_home -v 1.8)"
      ;;
    "gentoo")
      JAVA_HOME="$(java-config --jre-home)"
      ;;
  esac
}

function _show_java_help() {
  echo "* Please use Oracle(R) Java(TM) 8, OpenJDK(TM) or IBM J9 to run DATA2JSON."
}

# 设置 CLASSPATH
function build_classpath() {
  CLASSPATH="${DATA2JSON_HOME}:${DATA2JSON_CONF}:${DATA2JSON_LIB}"

  # augment with tools.jar, will need JDK
  if [ "${JAVA_HOME:-}" ]; then
    JAVA_TOOLS="${JAVA_HOME}/lib/tools.jar"
    if [[ -e $JAVA_TOOLS ]]; then
      CLASSPATH="${CLASSPATH}:${JAVA_TOOLS}"
    fi
  fi
}

# 设置 JAVA_OPTS
function setup_java_opts() {
  JAVA_OPTS=("-server")
  JAVA_OPTS+=" -Xms512m -Xmx512m -Xmn256m -Djava.awt.headless=true -XX:MaxNewSize=256m"
}


# Sets up the standard environment for running Neo4j shell scripts.
#
# Provides these environment variables:
#   DATA2JSON_HOME
#   DATA2JSON_CONF
#   DATA2JSON_DATA
#   DATA2JSON_LIB
#   DATA2JSON_LOGS
#   DATA2JSON_PIDFILE
#   DATA2JSON_RUN
#   DATA_START_WAIT
#   one per config setting, with dots converted to underscores
#

#usage="-e Usage: DATA2JSON\n\t
#        [--config <conf-dir>] {start|stop|restart|status|version}\n\t
#        [--version | version | -v]\n\t
#        [--help | -help | help]"
usage="Usage: $PROGRAM { start | stop | restart | status | version | help }"

# if no args specified, show usage
function print_usage() {
  if [ $# -le 1 ]; then
    echo $usage
    exit 1
  fi
}

#设置环境
function setup_environment() {
  _setup_calculated_paths
  #_read_config
  _setup_configurable_paths
}

# 设置HOME以及CONF目录
function _setup_calculated_paths() {
  #echo "_setup_calculated_paths()"
  if [[ -z "${DATA2JSON_HOME:-}" ]]; then
    DATA2JSON_HOME="$(cd "$(dirname "$0")"/.. && pwd)"
  fi
  : "${DATA2JSON_CONF:="${DATA2JSON_HOME}/conf"}"
  readonly DATA2JSON_HOME DATA2JSON_CONF
}

# Resolve a path relative to $DATA2JSON_HOME.  Don't resolve if
# the path is absolute.
function resolve_path() {
  orig_filename=$1
  if [[ ${orig_filename} == /* ]]; then
    filename="${orig_filename}"
  else
    filename="${DATA2JSON_HOME}/${orig_filename}"
  fi
  echo "${filename}"
}

# 读取配置文件
function _read_config() {
  # - plain key-value pairs become environment variables
  # - keys have '.' chars changed to '_'
  # - keys of the form KEY.# (where # is a number) are concatenated into a single environment variable named KEY
  parse_line() {
    line="$1"
    if [[ "${line}" =~ ^([^#\s][^=]+)=(.+)$ ]]; then
      key="${BASH_REMATCH[1]//./_}"
      value="${BASH_REMATCH[2]}"
      #echo "${key}=${value}"
      if [[ "${key}" =~ ^(.*)_([0-9]+)$ ]]; then
        key="${BASH_REMATCH[1]}"
      fi
      if [[ "${!key:-}" ]]; then
        export ${key}="${!key} ${value}"
        #echo "if ${key}"
      else
        export ${key}="${value}"
        #echo "else $key"
      fi
    fi
  }

  for file in "data2json.conf"; do
    path="${DATA2JSON_CONF}/${file}"
    echo $path
    if [ -e "${path}" ]; then
      while read line; do
        parse_line "${line}"
      done <"${path}"
    fi
  done
}

#function _setup_configurable_paths() {
#  DATA2JSON_LIB=$(resolve_path "$DATA2JSON_HOME/lib")
  ## get log directory
#  if [ "$DATA2JSON_LOGS" = "" ]; then
#    export DATA2JSON_LOGS="$DATA2JSON_HOME/logs"
#  fi
#  if [ ! -w "$DATA2JSON_LOGS" ] ; then
#    mkdir -p "$DATA2JSON_LOGS"
#    chown $USER $DATA2JSON_LOGS
#  fi
#  DATA2JSON_LOGS=$(resolve_path "$DATA2JSON_HOME/logs")
  ## get run directory
#  if [ "$DATA2JSON_RUN" = "" ]; then
#    export DATA2JSON_RUN="$DATA2JSON_HOME/run"
#  fi
#  if [ ! -w "$DATA2JSON_RUN" ] ; then
#    mkdir -p "$DATA2JSON_RUN"
#    chown $USER $DATA2JSON_RUN
#  fi
#  DATA2JSON_RUN=$(resolve_path "$DATA2JSON_HOME/run")
# 
#  readonly DATA2JSON_DATA DATA2JSON_LIB DATA2JSON_LOGS DATA2JSON_RUN
#}

# 引入配置文件的设置
_setup_configurable_paths() {
  DATA2JSON_LIB=$(resolve_path "${data2json_directories_lib:-lib}")
  DATA2JSON_LOGS=$(resolve_path "${data2json_directories_logs:-logs}")
  DATA2JSON_RUN=$(resolve_path "${data2json_directories_run:-run}")

  readonly DATA2JSON_LIB DATA2JSON_LOGS DATA2JSON_RUN
}

function print_configurable_paths() {
  cat <<EOF
Directories in use:
  home:         ${DATA2JSON_HOME}
  config:       ${DATA2JSON_CONF}
  logs:         ${DATA2JSON_LOGS}
  run:          ${DATA2JSON_RUN}
EOF
}

function print_path() {
  echo "home: $DATA2JSON_HOME"
  echo "conf: $DATA2JSON_CONF"
  echo "lib:  $DATA2JSON_LIB"
  echo "logs: $DATA2JSON_LOGS"
  echo "run:  $DATA2JSON_RUN"
}

function check_status() {
  if [ -e "${DATA2JSON_PIDFILE}" ] ; then
    DATA2JSON_PID=$(cat "${DATA2JSON_PIDFILE}")
    kill -0 "${DATA2JSON_PID}" 2>/dev/null || unset DATA2JSON_PID
  fi
}

function check_limits() {
  detect_os
  #echo "detect_os"
  if [ "${DIST_OS}" != "macosx" ] ; then
    ALLOWED_OPEN_FILES="$(ulimit -n)"
    #echo ${ALLOWED_OPEN_FILES}
    #echo ${MIN_ALLOWED_OPEN_FILES}
    if [ "${ALLOWED_OPEN_FILES}" -lt "${MIN_ALLOWED_OPEN_FILES}" ]; then
      echo "WARNING: Max ${ALLOWED_OPEN_FILES} open files allowed, minimum of ${MIN_ALLOWED_OPEN_FILES} recommended."
    fi
  fi
}

function set_mainjar() {
  if [ -f "$DATA2JSON_HOME/data2json/data2json.jar" ] ; then
    MAIN_JAR="$DATA2JSON_HOME/data2json/data2json.jar"
  else
    echo "jarfile doesn't exist"
  fi
}

function assemble_command_line() {
  #retval=("${JAVA_CMD}" "-jar" "${JAVA_OPTS[@]}" "-Dfile.encoding=UTF-8" "${MAIN_JAR}" \
          #"--home-dir=${DATA2JSON_HOME}" "--config-dir=${DATA2JSON_CONF}")
  retval=("${JAVA_CMD}" "-jar" "-Dfile.encoding=UTF-8" "${MAIN_JAR}")
}

###################################
#(函数)判断程序是否已启动
#
#说明：
#使用JDK自带的JPS命令及grep命令组合，准确查找pid
#jps 加 l 参数，表示显示java的完整包路径
#使用awk，分割出pid ($1部分)，及Java程序名称($2部分)
###################################
#初始化psid变量（全局）
psid=0

function checkpid() {
  javaps=`ps -ef | grep data2json.jar | grep -v "grep"`
  echo $javaps
  if [ -n "$javaps" ]; then
    psid=`echo $javaps | awk '{print $2}'`
  else
    psid=0
  fi
}

# 启动程序
function do_start() {
  check_status

  if [[ "${DATA2JSON_PID:-}" ]] ; then
    echo "DATA2JSON is already running (pid ${DATA2JSON_PID})."
    exit 0
  fi

  echo "Starting DATA2JSON."

  #check_limits
  build_classpath

  assemble_command_line
  command_line=("${retval[@]}")
  # 输出到日志文件
  #nohup "${command_line[@]}">>"${DATA2JSON_LOG}" 2>&1 &
  ##nohup "${command_line[@]}">>"${DATA2JSON_LOG}" 2>&1 < /dev/null &
  #显示该文件末尾10行的内容
  #tailf ${DATA2JSON_LOG}
  # 输出到终端
  (${command_line[@]} &)
  #echo "$!" >"${DATA2JSON_PIDFILE}"
  checkpid
  #echo $psid
  echo $psid >${DATA2JSON_PIDFILE}

  : "${DATA_START_WAIT:=5}"
  end="$((SECONDS+DATA_START_WAIT))"
  while true; do
    check_status

    if [[ "${DATA2JSON_PID:-}" ]]; then
      break
    fi

    if [[ "${SECONDS}" -ge "${end}" ]]; then
      echo "Unable to start. See ${DATA2JSON_LOG} for details."
      rm "${DATA2JSON_PIDFILE}"
      return 1
    fi

    sleep 1
  done

  #print_start_message
  #echo "See ${DATA2JSON_LOG} for current status."
}

# 关闭程序
function do_stop() {
  check_status

  if [[ ! "${DATA2JSON_PID:-}" ]] ; then
    echo "data2json not running"
    [ -e "${DATA2JSON_PIDFILE}" ] && rm "${DATA2JSON_PIDFILE}"
    return 0
  else
    echo -n "Stopping data2json."
    SHUTDOWN_TIMEOUT=20
    end="$((SECONDS+SHUTDOWN_TIMEOUT))"
    while true; do
      check_status

      if [[ ! "${DATA2JSON_PID:-}" ]]; then
        echo " stopped"
        [ -e "${DATA2JSON_PIDFILE}" ] && rm "${DATA2JSON_PIDFILE}"
        return 0
      fi

      kill "${DATA2JSON_PID}" 2>/dev/null || true

      if [[ "${SECONDS}" -ge "${end}" ]]; then
        echo " failed to stop"
        echo "data2json (pid ${DATA2JSON_PID}) took more than ${SHUTDOWN_TIMEOUT} seconds to stop."
        echo "Please see ${DATA2JSON_LOG} for details."
        return 1
      fi

      echo -n "."
      sleep 1
    done
  fi
}

function do_status() {
  check_status
  if [[ ! "${DATA2JSON_PID:-}" ]] ; then
    echo "data2json is not running"
    exit 3
  else
    echo "data2json is running at pid ${DATA2JSON_PID}"
  fi
}


function do_version() {
  echo "${DATA2JSON_VERSION}"
}

#function do_version() {
#  build_classpath
#
#  assemble_command_line
#  command_line=("${retval[@]}" "--version")
#  exec "${command_line[@]}"
#}

function main() {
  #print_usage
  setup_environment
  #print_path
  
  DATA2JSON_LOG="${DATA2JSON_LOGS}/data2json-$USER-$HOSTNAME.log"
  DATA2JSON_PIDFILE="${DATA2JSON_RUN}/data2json.pid"
  readonly DATA2JSON_LOG DATA2JSON_PIDFILE
  
  setup_java_opts
  check_java
  set_mainjar
  #echo "end set_mainjar"
  
  case "${1:-}" in
    start)
      print_configurable_paths
      do_start
      ;;

    stop)
      do_stop
      ;;

    restart)
      do_stop
      do_start
      ;;

    status)
      do_status
      ;;

    version|--version|-v)
      do_version
      ;;

    help|--help|-help)
      echo "Usage: ${PROGRAM} { start | stop | restart | status | version | help }"
      ;;

    *)
      echo >&2 "Usage: ${PROGRAM} { start | stop | restart | status | version | help }"
      exit 1
      ;;
  esac
}

#运行main函数
main "$@"

最后，运行，在命令行输入：

#启动，在data2json目录下
./data2json start  
#关闭，在data2json目录下
./data2json stop

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shell调用java程序jar找不到main方法

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